asilverblazer

Upstream O2 sensors control how the engine runs. The downstream O2 sensors determine condition of catalyst. The upstream sensor is controlling the fuel trims. The downstream may eventually throw a catalyst system efficiency code, but nothing related to drivability. Cylinders 1 and 4 are on different banks so fuel trim of bank 1 causing misfires on bank 2 would be odd. I would also confirm that the P0300 is in fact described as random, sometimes it is not described as 'random' but as a confirmation that misfires are happening (in conjuction with P0301 and P0304 in your case). This might rule out or confirm the misfires is happening ONLY on cylinders 1 and 4 or MOSTLY on cylinders 1 and 4. The ONLY unique items to check on those cylinders would be plugs, wires, cap, valves, compression. For a mostly condition that opens the amount of items to check up further to include injectors, vacuum leaks, etc. In summary, PCM's don't get confused so I think you need to keep digging elsewhere. Try disconnecting the battery for a while to reset the PCM, might give you a warm fuzzy feeling about it.

I wonder how much of this is driven by dealers building up stock in preparation for the potential (and occurrence of) the strike? Plus there have been a lot more incentives on the new trucks of late. My crystal ball says that will be the best quarter for the year.

Had them getting in my GMT900, never did figure out how though. Lots of poison outside around the house and driveway seemed to do the trick. Nothing like having a mouse run across your foot while driving down the highway will cause quite interesting diving maneuvers.

Torque converter clutch solenoid? Try lightly pressing the brake pedal (only enough to illuminate the brake lights) when the noise starts, This will electronically tell the TCC solenoid to unlock. Just got through replacing this part on another truck that exhibited similar symptoms. The solenoid was worn in such a way that it would not lock the converter like it should and would instead cycle between engaged and not (very rapidly), making a rumbling noise. That is why turning it 'off' or unlocking it with the brake pedal would make the noise go away.

Bad fuel pressure regulator = extended warm cranking times.

Don'y forget about vent tubes, front axle, transfer case, rear differential. Front and rear diff vents are right on top of the frame rails, going any deeper risks water entering the diffs and contaminating them. Some even feel the same about wheel bearings, basically hub depth.

I had trouble with them getting in my 2007, nothing will quite cause a scene driving down the highway like a mouse running across the floorboard. They made nests in my glove box, under the rear seat, etc. had babies in there too. Never could figure out how they were getting in. I resorted to lots of poison around the house.

Pulling the fuse usually disables electronic devices. I don't know how to take apart the thing, but usually there is a plug in the back that could be unhooked to. oooh, I'm scared now, don't sue me...

Suburban third row isn't bad. Tahoe third row awful.

Cameras and software are cheap, throw abunch of those in the trucks, that'll sell 'em. ...seriously, the Ram interior is beyond comparison more luxurious. Newsflash GM et. al., trucks aren't just used in construction/farming anymore, if marketing is selling a luxury truck, better have the goods to back it up.

Below par crash test ratings, average fuel economy, average power train, average power and torque, polarizing looks, lamest attempt ever at interior... higher transaction prices. Not to mention missing some of the simplest amenities to include in a fresh redesign, how about a large sunroof? Mild hybrid, cruise control with automatic speed adjust? The only functionally better hardware GM offered in the 're-design' new tailgate functions (on select models), wider bed... There is absolutely no reason to buy one of these trucks over their competitors. (Unless in my case you hope to get the same reliability as the last GM you bought.) Hope the new trucks get the same emergency refresh treatment that Camaro got. Otherwise, I expect the demise of the new trucks to continue to lose market share to Ram. If I had GM stock, I'd be selling, because the cash cow trucks aren't.

Same thing on my 06 Caddy, changed the pump, cured the problem. There should be no pressure loss overnight. My symptoms were extended crank times. But diagnosis, revealed similar condition, fuel pressure not holding with pump off.

My 2007 did something similar, the driver side wouldn't get quite as cold as the passenger. I removed the actuator for drivers side blend door, took it apart and cleaned it. (It didn't appear dirty inside) Put it all back together and did the blend door relearn procedure. All was well after that.

Sounds like ignition to me too. Plugs and wires is where I would start and use AC/Delco parts. Coil packs typically out live plugs and wires.

Armorall Tire Foam is pretty amazing in the engine compartment. Spray it on and forget it...