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intermittent engine quitting

Engine

Vehicle Information: Model: 911 Carrera ; Year: 1986; Body Type: Convertible; Engine (type, size, modifications): 3.2l stock; Total Mileage: 136000;

I am having problems with the engine just shutting down. I bought the car 2 years ago and it was running fine. I had to take it in to be emissions tested and it failed miserably. The shop said the O2 sensor was unplugged. They plugged it in and it almost passed but they replaced it and it did pass. Then I drove it to work and it was fine, When I left work, I pulled out of the parking lot and as soon as I hit 3000 rpm in 2nd gear the engine shut off. No sputtering, just shut off and the tach needle steadily dropped. I tried for several minutes to get it to start up. After about 5 minutes it started up and I drove home about 15 miles without any problems. The next day I was going to work and it shut off about 5 miles from home. I got it started and headed home but it shut off again in about 2mi and again when I was almost home. It now happens just going around the block. Usually, it shuts off in 2nd or 3rd gear at around 3000-3500rpm. It will idle fine and happlily revs to 6000rpm in neutral. I have not gotten it to shut off going up and down the driveway or idling.I have replaced the fuel pump, DME relay, distributor cap, rotor, spark plugs, speed sensor, reference sensor and cylinder head temperature sensor. I have done electrical tests on all of the other sensors and all are in range when the car is in the garage. Please help I am running out of ideas. Thanks, Dan Johnson

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