When I have the AC on and I disengage the clutch to stop the RPM's fall below normal idle and the engine starts to shutter as if its just about to stall. Any Ideas? This does not happen when the AC is off.

 

There are several things that can be causing this. Some things to try.
1. injector cleaner
2. MAP sensor whack
3. clean throttle body (I believe ckit has a thread about a groove in the throttle body where air is supposed to get to the MAP sensor being clogged, clean that)
4. replace fuel filter
5. replace MAP sensor

One of those should work. If not, a trip to the dealership is in order.

 

map whack was my first choice.

 

It now just did it without the AC on

80K miles FYI

 

reset the ecu. disconnect that battery for about 5 minutes. Is it throwing any DTC's (CEL) light?
Is it running rough? or just stalling out?

 

It is running just fine with no CEL. How do I do MAF Wack?

 

+1

 

This can also start happening if you over-revved and compression is shot but try the other thing first.

 

this is also kind of happening to me... sometimes.. not too often though.

 

to do the map whack just take a screwdriver and flip it around then with the handle facing out tap the top of the map senser firmly a couple of times. reset the ecu then rev it up, if it starts to do it just let it fix itself. its a learning ecu so it may take a little to fully adjust