I am having an intermittant problem with my '89 760 TI. --- LH 2.2

Saturday I was driving on the interstate and was about 25 minutes into my 30 minute trip. Driving along at 65 mph and the tach started dropping to 0 rpm. It would recover and show normal rpm, 2500 to 3000. I was loosing power but it never died and I barely lost any speed. I was near my destination and exited the interstate expecting it to die on the ramp, but never had any more problems, incluing the return trip home.

Tonight, local trip (40 mph surface street) about 12 minutes from home and the same thng happned. I got to my destination without any further problem and returned home without any additional symptoms.

Four or five weeks ago. Driving along about 1/2 mile from home and car looses power, tach jumps around as above and it stalls. I tried to restart, but it just would not run. Fuel relay clicking when I turned the key on, so I pulled the AMM connector. It restarted right away and I drove home in limp mode. Re-seated the AMM connector a couple of times and restarted and it ran fine till Saturday.

Question: Am I being confused into thinking it is a problem with the AMM or AMM connector? Could this really be an early warning of a hall sensor failure in the distributor?

I claned both connectors with electrical contct cleaner and applied a small amount of silicone dialectric grease to the connectors.

Thanks in advance for your help.

Dan