CAN YOU KEEP IT RUNNING WITH BOTH FEET? (GAS BRAKE) IF NOT POSS. WIRE HARNESS PROBLEM. PERFORM WIGGLE TEST. WITH ENG.RUNNING MOVE WIRE HARNESS AROUND PULL TWIST ECT. ENGINE MOVES AS TRANS. IS SHIFTED,REV MAY NOT MOVE HARNESS ENOUGH TO CAUSE STALL, BUT DRIVE MIGHT! ALL WE CAN DO HERE IS GIVE A BEST GUESS. HAD IT SCANNED??
can keep runing if main trans connector is unplugged. can also keep running if car is jacked up and put in drive, wheels spin, but once brake is applied, it dies... a buddy of mine thinks its mechanical rather than electronic
Going along with wetrys' answer #1 , what condition are the engine mounts in? If they are worn allowing excessive engine movement then what he suggested is a good place to start-bright lights -open eyes.
They could be allowing enough movement of other components/connections to create a vacuum leak or open electrical contact. Start looking for hoses or wires that are affected , while someone else is in the car holding the brake and putting it in gear........ Going by your previous description of conditions , it WILL go into gear and stay running if the TCC is unplugged , correct? Then if you plug the TCC back in , and put it in drive , does it feel like popping the clutch on a manual trans when it dies? If so , then try to find a way to have it scanned 'live data' and see what the TCC 'command' is and we'll go from there.