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04-17-2009, 06:59 PM
| #1 |
| Junior Member Join Date: Apr 2009
Posts: 4
 | sporadic miss '91 GMC with '92 350 misses sometimes when it is started. May miss for 1 to 3 miles so bad it will hardly go up a hill. I put new plugs, cap, rotor, coolant temperature sensor on. Wires are good. Sometimes it starts and runs great. Never misses when a mechanic or tech is around. I'm wondering about the ignition module or pick-up coil. Any ideas? |
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04-17-2009, 07:32 PM
| #2 |
| Senior Member  Join Date: Jun 2007
Posts: 296
 | Could be your EGR or IAC valve, (Idle Air Control) |
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04-17-2009, 08:57 PM
| #3 |
| Senior Member Join Date: Feb 2008
Posts: 172
| check for vacuum leaks sparay soapy water on plug wires, watch for cracking noise. spray carb cleaner on vacuum lines and gaskets, if it bogs from some area - you got your culprit. definitely clean EGR and PCV. |
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04-18-2009, 07:26 PM
| #4 |
| Senior Member  Join Date: Mar 2009 Location: South Jersey
Posts: 58
| I had a few of those trucks in my fleet. Question is what does the intake look like and is it Throttle Bottle Injected. Other is, any codes coming up. |
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04-20-2009, 02:04 PM
| #5 |
| Junior Member Join Date: Apr 2009
Posts: 4
| Thanks for taking time to reply. I'm reading them but haven't had time to act on advice yet. rpp |
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