Make sure the battery has a full charge, if it is down, use a charger and get charged up. Make sure battery connections are all good and charging system is okay.
How long since a tune-up? Any applicable trouble codes? With some makes and models, if the battery voltage is lost, it could cause problems with some modules? Those modules may have to relearn or be reprogrammed.
Make sure you security system isn't causing any problems.
With idle issues, check and clean idle air system.
If the battery is down, we're just spinning our wheels, with testing. Just my opinion.
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Saturday, March 19th, 2016 AT 5:18 PM