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'97 stumbles at low RPM's

Chris97K1500

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Chris97K1500 Enthusiast

Chris97K1500

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Recently I've been noticing, especially today, that around 1000-1500rpm's the truck stumbles, like it's not getting gas. If I punch the gas a little, it clears up and runs fine. Fuel filter is new, plug wires are new, new Copper TR55 NGK's with about 2K miles on them. Once I get out of that range, it hauls with no problems. Any ideas? Thanks, Chris

citydriver Enthusiast

citydriver

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Posted
Recently I've been noticing, especially today, that around 1000-1500rpm's the truck stumbles, like it's not getting gas.  If I punch the gas a little, it clears up and runs fine.  Fuel filter is new, plug wires are new, new Copper TR55 NGK's with about 2K miles on them.  Once I get out of that range, it hauls with no problems.  Any ideas?  Thanks, Chris

 

 

 

 

How fast r you going when this happens, could it be around 40-45mph? Torque converter lag? Or am I blowin smoke outa my a$$ ? :thumbs:

citydriver Enthusiast

citydriver

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Posted
Nope, just in 1st gear, usually around 10-15mph, sorry, should have put that in there.  Chris

 

 

 

 

Can you feel the transmission trying to shift to 2nd when it does this? Possible bad spring in the 1-2 servo

or...... Is it noticeable when it is in Park/neutral, does it sound like its surging in that RPM range?

If it feels like the engine is not gettin fuel, try checking the TPS (Throttle Position Sensor) It may have a bad spot in it....just a guess :thumbs:

Chris97K1500 Enthusiast

Chris97K1500

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Sorry to sound stupid, but where is the TPS? It doesn't seem like it wants to shift, just during the rpm climb from 1000 to 1500 it's like it cuts out, not getting gas. Plus it only does it if I take off slowly, if I take off a little faster, doesn't do it, goes up the rpm range fine. Thanks, Chris

SoylentGreen Enthusiast

SoylentGreen

Posted
Posted
Fuel filter is new, plug wires are new, new Copper TR55 NGK's with about 2K miles on them.  Once I get out of that range, it hauls with no problems.  Any ideas?  Thanks, Chris

 

 

 

 

Check your plug wires, make sure they are seated firmly. Had a simular problem when I changed the plugs and wires on a 94 Burb I had. I checked the plug wires and wella one was a little loose, re-sat it and problem solved.

citydriver Enthusiast

citydriver

Posted
Posted
Thanks, I'll look it over again in the morning.  Today wasn't noticeable.  I wonder if I got bad gas?  I got it from a place I've never gotten gas from before.  Chris

 

 

 

 

I got bad gas too, my wife threw me outa the house :chevy::thumbs:

 

Bad gas may be the cause, you could try and toss some octane booster in the tank and then top it off w/fresh gas......

P.S. The TPS is mounted to the side of the throttle body or TBI unit and is on the opposite side of the throttle plate from the accellerator cable,it has 3 wires going to it (signal, reference and ground) and kinda works like a dimmer

GMCTech Enthusiast

GMCTech

Posted
Posted

Did copper plugs come out of it?

 

What is the gap spec on the emissions sticker under the hood?

 

What did you gap your plugs to?

 

I have seen a few trucks that ran like absolute dog sh** with copper plugs that were designed to run platinums. Just changing to platinum or iridium ACDelco plugs did the trick.

 

Hope this helps.

Chris97K1500 Enthusiast

Chris97K1500

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Thanks, I will be taking the copper plugs out this weekend. Putting stock AC Delco's back in. Hopefully that's the cause. I'm also getting the driver's side inner and outer tie-rods replaced next Tuesday, they are also going to see if I have a leak somewhere (intake gasket?). I noticed the temps would go up sitting in traffic, never did before until it started to run bad at low rpm's. The overflow tank is losing coolant, because it's well below the correct marks, I've been filling it back up about once every 3 days. I also believe I smelled the "sweet" smell of coolant today while sitting at a light. Thanks, for the help! Chris

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