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You might want to check that Idle Air motor on the throttle body itself. It could be plugged. Sounds like a corker though. Basically if it's fuel injected you need a few things to have good idle. The crank sensor tells the ECU where to time spark, the TPS tells the ECU in what position the actual throttle plate is. The ECU uses this info from the TPS to tell that IAM Idle air where to be to start and maintain idle. It sounds like the timing ( crank sensor ) is functioning. I would look towards the TPS and the Idle Air both those units are on the throttle body itself. I think these have and adjustable TPS so you'll need to get some info on how to set one. As for the Idle air being poss plugged. You can remove it ( thre s\phillips screws) and clean it out with good carb cleaner. Be sure to spray into the port where it goes back. Then spray some wd40 on the plunger itself. It's Not too complicated. You can do it It's a start anyway