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Found 2 results

  1. Having some issues with my '93 C1500 stalling and dying. It started last month when I was replacing parts to get my truck back on the road after sitting for a long time without much use. After I had managed to get the A/C blowing cold air again (freon, compressor pigtail and tensioner pulley) I noticed that the idle would slow and get choppy, even stalled and died once. I went back to work on it and ended up putting in a brand new Delco egr valve, IAC, fuel pressure regulator assembly, emissions tubing, intake adaptor, intake and egr solenoid. Even with all the parts the truck will still stall with or without the ac engaged and gets significantly worse with the egr solenoid plugged in. As in it stalls terribly at very light throttle since it looks like the valve completely closes when you hit the throttle just right. The engine is a jasper 350 crate with around 80k miles and Ive replaced every single sensor on it at some point or another. I should also mention that before this work was done I'd had the egr blocked off completely with a plate and an adjustable fuel pressure regulator in. I just wanted to get it back to stock once the stalling started so I could have a reliable truck again. At this point i'm worried the problem may be in the pcm or prom since it was running great most of the day with the solenoid unplugged then started stalling again after sitting for an hour turned off. I'm stumped
  2. I have a 1994 GMC Yukon 350 TBI 4WD that has a significant lope to the point of stalling, especially when in gear. When in park it will lope between 800 to 1000 rpms and when in gear sitting still will lope between 200 and 700 rpms and every so often, stall out. You can feel an intermittant stumble when actually driving although tach doesn't show it then. The stall will also occur sometimes when coming to a stop. The motor has plenty of power. Changed almost all sensors/components - see below for list of replaced items. I can temporarily fix the issue if I unplug the Coolant Temp Sensor the truck will stumble really hard several times and if it doesn't stall, it will smooth out completely 800 RPM for about 1 minute then starts to stumble again. Putting the vehicle back into park, plugging the CTS back in then putting the vehicle back into gear for about a minute then unplugging the CTS again will once again will repeat the temporary fix most of the time. Plugging the CTS back in once the lope has started has no effect. I have checked the voltage going to the CTS and it remains a steady 5V. I have tried 3 CTS's with the same results. Also about one in every 20 trips the vehicle will show no signs of any lope or stumble or very little. Could this be a PROM issue? Replacements already performed: ECM(computer) - had to use old PROM as new ECM doesn't come with it. Coolant Temp Sensor (x3) EGR and solenoid IAC (x2) Vacuum lines everywhere MAP sensor Fuel Pump Fuel Filter Distributor (whole thing) Plugs/Wires Coil Injectors Fuel Pressure Regulator Intake gaskets Removed and cleaned all grounds Alternator TBI Gasket Thermostat 195 Suggestions from any GM Genius'?
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