My '91 744t has an intermittent stalling problem. Seems to have become less frequent since it got butt-ass cold out. The tach will drop slowly until about 1000 rpm and then drop to 0 and my dash lights will turn on. It always restarts. If the engine is cold it starts first time, if warm it will take about 2-3 minutes to start. I replaced my AMM with a "new" used one a couple months back. I was having the problem then but it rarely happened. I also replaced the plugs, crank position sensor, and fuel filter. I checked the fuel pump relay and it seems to be working fine. I'm all out of ideas and I need my car to work right now! Please help me! Thanks!