b16a obd-0: Whenever im acclerating and then, diengage clutch and let off the throttle completly the car will backfire slightly as the engine winds down below 1000 rpm or so. Also whenever I turn the engine off it sounds like it blows air out of the intake maybe 2seconds after i turn the key off. put put... poof. Not noticing any other symptoms, car idles fine acclerates fine. Things i've tries so far. New spark plugs, igniton timing adjustment. Also I just recently installed a VAFC, but I dont have it set to scale the map signal at all.

 

the second problem is totally normal because the engine dosent turn off as fast as you can turn the key off, the monentum carries it for another couple revolutions.

the first one is way too vauge and makes no sense to me.

 

I was going to suggest the timing is off with that backfire, but...