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Also if you started your car cold, moved it a short distance (say into or out of your garage) and then shut it off, it may start hard and idle rough the next time..
Commonly referred to as "car wash syndrome" (i.e. you move it to wash it but it doesn't have time to warm up)..
It clears itself up once the engine warms up. The problem is the engine thinks it's already warm after the cold start/stop for some reason.

If thats not it then definitely check the ICM, and if thats it, get the $120 unit and replace it yourself in 5 minutes with just a screwdriver.
 
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