Well about a month ago I started having a intermittent miss on the highway with my 87 745 Turbo.
Last week the car died and I was able to get it restarted by unplugging the AMM and reconnecting it. Figured since it quickly restarted it must have been a bad AMM. My tech lent me a spare unit he had on his bench and the car ran great over last weekend while I was waiting for my new one to come in from Volvo.
Figured I must have caught the problem since no problems since Tuesday when I installed the new AMM. Today this miss started all over again and it is really starting to piss me off trying to pin it down. I have replaced the AMM, powerstage, fuel regulator and the main fuel pump. It has all new plugs, wires, cap, rotor, air and fuel filter. The engine harness was replaced about 5 years ago and the distributor was replaced about 2 years ago also. It only happens after the car has been running for a while and is nice and hot the problem reals it ugly head. You'll be cruising along and the tach drops momentary 200 or 300 rpms and go right back up. Any ideas what is going on because it idles fine except when it died in the middle of the road last week.