Backfire-after turning key off

TF360 said
Ok- When it was running I also noticed that the idle was staying kind of high and when I put the car in gear(4-speed) the idle would come down. Don't know if it's related. What do you guys think?
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Are you aware of fast idle, as part of the choke function? Cold gear oil loads the engine a bit. Had a bug that would drive in neutral at -10F.