There might already be a thread answering this question, however I thought this might be faster and return more up to date information:
I have a 1988 MX-6 GT (turbo) (STD Transmission) with 230,000 miles. I just put in a new AC compressor and dryer. I noticed that when I am approaching a red light, or stop and I let go of my accelerator, I noticed that the RPMs virtually go down to almost 200 revolutions. In about 2-3 seconds time it goes back to 750 (normal idling rpms). What is the cause of this? Injectors? ???
check your throttle body boot. If it is still the stock one, it's LONG overdue for replacement. I had similar problems but with my atx. I've had the car stall when coming to a hard stop. Check this first, it's the simplist fix.
its a vaccum leak of some sort, i would check the TB boot since its problly ur problem and is comon on our cars, other than that check any tube that holds vaccum such as IC piping, intake, and small misc. vac lines in engine compartment
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