When engine stalls/misfires under load, it should not be caused by the trans. I believe the problem you are facing is engine performance related.
Did the problem occur before the head gasket replacement?
What is the idling rpm?
Does the engine idling rpm drop/fuctuate with AC turned on/off.
1. Do a compression test?
2. Check the ignition timing?
3. Check valve timing?
The trans is controlled by the PCM and operated by solenoid switches so there are no vacumn lines to cause idling problem.
Tuesday, September 30th, 2008 AT 8:39 PM