Question about GMC Sierra
The only solution I can offer is temporary and could help you at least pass inspection.
WARNING: This is a last resort effort. Prolonged use of Ethanol (E85) in engines not designed for it can deteriorate rubber fuel lines, oxidize aluminum, and dry gaskets causing them to crack.
Posted on Nov 16, 2013
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Posted on Jan 02, 2017
SOURCE: Rough idle
Jeep has been having a problem with this. i take it u have a 4.7L or a 3.7L. when the when to fix this problem they should of replaced all the valves (intake and exhaust). theres a tsb on this and the dealer can look it up. even if you paid for the service they will fix it for free cuz it wasn't fixed the first time. take it back to the them and tell the to read the tsb and fix it right.
Posted on May 15, 2008
My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.
Posted on Dec 10, 2008
my 89 corvette is hard to start when it is cold, and runs very rough for about a minute. replaced the IAC and Maf sensors had the throttle body cleaned, now it idles very high and emits the same problems. i also had the injectors cleaned.
Posted on Sep 19, 2009
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