Question about 1998 GMC Sierra
Was driving along and the truck died instantly, but still had dash lights. thought it might be fuel pump at first, but after letting the truck cool a bit, it started and idled rough then I noticed when trying to limp it home everytime I applied the brakes or turn on the headlights, it would die. tried disconnecting the battery to clear codes, but no luck same problem. Starts everytime but idle's rough ( low RPM'S less than 500) any suggestions?
Have you checked out your fuel filter? I had my 2003 denali do the same type of problem and it turned out to be a very dirty fuel filter.
Posted on Sep 06, 2008
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Posted on Jan 02, 2017
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Here are the most common causes of idle surge, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake
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