Dies when idling, does better with a/c on, but still dies
this is your problem:
Here are the most common causes of surges, stalls at stops, low 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
2003 6.0 same problem
1999 Silverado with 5.3 liter engine. Started having a high idle problem. Engine wants to idle at 1,000 RPM after it's been driven and heats up. Cleaned the EGR valve, cleaned and tested the IAC valve. After the engine cools down the idle comes back to the factory specs. 5-600 RPM's.
I have no idea where to look next. Any ideas?
RB
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