THE TRUCK IS RUNNING EXTREMELY ROUGH,SOMETHING KEEPS CAUSING THE SPARK PLUGS TO FOUL OUT INSTANTLY ANY IDEAS?

  • Tiny
  • Chuck cook
  • 1999 Chevrolet Truck
  • 180,000 miles

I had just got done changing the plugs on the truck and it was running great for a couple days, my wife was driving one day and she said the truck smelled hot and just started running real rough and it's been that wAy ever since it's undrivable, can't afford to take it to a shop.

Monday, September 12th, 2011 AT 7:24 PM

3 Answers

  • Tiny
  • promechanic
  • Expert
  • 551 posts

Start by taking it to an auto parts store and having them check the codes. They will normally do this for free.

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Monday, September 12th, 2011 AT 7:30 PM
  • Tiny
  • passdahotsauce
  • Member

I've learned that in the 99 Chevy Trk/Sub 5.7 only the AC Delco Spark plugs work. 5yrs ago I changed my spark plugs 3 times in the same month and it ate those spark plugs up. So I shelled out cash for the $8.99 each AC Delco's and problem was fixed. I still have the same spark plugs in my 99 Sub today. I clean them with a battery post wire terminal cleaner and there as good as new.

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Wednesday, September 14th, 2011 AT 2:27 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 19,840 posts

"I clean them with a battery post wire terminal cleaner and there as good as new. "

That's the wrong thing to do. It leaves metal tracks for spark to jump over. NEVER take a wire brush to a spark plug. You should never need to anyway if the engine is running correctly.

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Wednesday, September 14th, 2011 AT 2:34 PM

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