It could be that the computer may need to go through a relearn process if the battery was out for a period of time. Also, the idle issue sounds like one of two issues. The idle air control valve is responsible for maintaining a steady idle. That could be going bad. Also, check for vacuum leaks around the engine that could cause a rough idle. Finally, drive the vehicle (if it is safe) and see if it fixes itself after the computer does its job. If it doesn't disconnect and reconnect the battery again to see if that will reset. Keep in mind, it could take nearly 100 miles for the computer to cycle through all its modes.
One last thought, if it doesn't reset, you may need to have the computer flashed by a dealer.
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Saturday, September 3rd, 2011 AT 3:33 AM