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1990 GMC C1500 Chug and Studder

Tiny
MGEE
  • MEMBER
  • 1990 GMC C1500
  • V8
  • 4WD
  • MANUAL
  • 190,000 MILES
HI, I replaced the spark plugs, wires, distributor cap and rotor. I replaced the fuel filter, O2 sensor, IACV, air filter and moved the starter so that the wiring is under the heat shield and protected from moisture. After replacing the IACV, the truck stopped chugging and studdering. Then it came back. It only happens when I have my foot on the gas at about 1/4 pressure and the engine is up to normal operating temperature. When it is in neutral or coasting in gear, it does not happen. The TPS is the only thing I haven't replaced, as well as the injectors. Also, the "Check Engine" light does not always come on when this happens. I am not sure if the money is worth spending, because now it feels as though I'm simply throwing money at it and hoping it works. Thanks for your help.
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Sunday, September 12th, 2010 AT 10:52 AM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,328 POSTS
Have you had the computer scanned?
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Tuesday, September 14th, 2010 AT 10:47 AM
Tiny
MGEE
  • MEMBER
  • 11 POSTS
No I have not scanned it, because I was told the "Service Engine Soon" light has to be on when they scan it and it doesn't always come on.
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Wednesday, September 15th, 2010 AT 12:09 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,328 POSTS
I understand. However, when the light is on, it needs to be done. It could be caused by several things. Without the computer being checked, it becomes a guessing game.
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Wednesday, September 15th, 2010 AT 9:16 PM
Tiny
MGEE
  • MEMBER
  • 11 POSTS
How much can I expect to spend asking a mechanic to scan my computer?
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Thursday, September 16th, 2010 AT 1:12 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,328 POSTS
Most nationally recognized parts stores will scan them for free. That is where I would start. It would be cheaper to purchase your own OBD II scanner that pay a mechanic.
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Thursday, September 16th, 2010 AT 1:21 PM
Tiny
MGEE
  • MEMBER
  • 11 POSTS
Ended up selling the truck and cutting my losses before having to shovel around it all winter!
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Saturday, April 9th, 2011 AT 3:29 PM

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