1997 Q45T Runs rough after warm up

[cigardave007]

Greetings All,

Have poured over the many post on rough running Q45's and have done a lot of work to no avail

She runs fine when cold. Afeter the temp gage reaches just below half way (normal running temp) She will "stumple" while accelarating or driving steady. Kinda feels like cutting the key off and on. If I stop the gas she revs up fine. Idle after warm up is "choppy and will eventually go dead.CEL cold is EGR. No misfire cold. (Autozone checked it for me)

Things I did are

1) Removed EGR and ACC and cleaned with solvent2) Removed about all of the electrical connections and spray with electrical cleaner.3) Check the plugs. Looked fine. Number 6 looked like new!?? I replaced all the plugs about 8k ago. NGK4) Change fuel filter5) Did a BG44 treatment thru the brake vacuum hose. and in the tank. It did run better but didn't solve the problem

My next step is the MAF. When I unplug it the car does go dead. Is that suppose to happen??

I don't seem to get a lot of vacuum(air) at the EGR. When I unplug it I don't get a noticable hiss. Also if I push the valve thing up with my finger the car will go dead.

Looking for any ideas. I'm learning way too much about Q45's

I'm going thru a rough time and just don't have the bucks for a trip to the dealer.

Thanks

[email protected]
Modified by cigardave007 at 1:10 PM 4/2/2008

[maxnix]

Tou shallt not double post!