Question about 1999 GMC Sierra
My 6.0l gas Sierra bucks like a bronco, sputters and pops when cold. This goes on for 1/2 to one mile then OK. Always a slight hesitation when pulling out from a stop. Dealer found no bad ''codes''. Replaced fuel pump, fuel reulator, now he wants to replace the fuel rails! I said no, I'll live with it. Dealer seems as if he don't know whats wrong and just wants to replace all parts. This is a 1999 6.0 gas with 68,000mi.
Could be an engine or air temperature sensor problem or a dirty throttle body.
You can check the values of the sensors with an ohmeter getting the specs hot and cold from a manual or your local auto parts store.
The throttle body needs a spray cleaner designed for throttle bodies only as some may damage plastics.
Posted on Jun 20, 2009
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Posted on Jan 02, 2017
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