Inspect and clean IAC valve (idle air control valve), replace if necessary. If IAC is Ok, please provide additional info!! Does your vehicle experience random or repeated hard starts?? Is your "service engine soon" light on?? These vehicles are known for faulty crank position sensor, usual symptoms are: hard starts, random/constant stalls, SES light on, misfire or no start. Some or all symptoms may or may not occur simultaneously.
This is the first time I experienced this with this car, yet, as you mentioned, the "Service Engine Soon" light has been on for all the time we have had the car, since we bought it from a "Lemon Shop". I was told that it could be anything from a gas cap change to a minor (or major) thing of the past. Yet, otherwise, it has run OK, except for the blower not working. ,
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