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This car is on the road again after a hiatus that lasted about a year and a half. I thought I would share the experience in case it might help anyone else with the same problem. The car is an intercooled 1983 240 turbo, automatic transmission, Bilsteins, IPD sway bars, etc, etc. I last posted a problem with the car stalling while being driven, but only after it had gone about 10 miles or so; then restarting almost immediately or after a short wait. This would be followed by intermittent stalling from then on until I would get home. Once home, it would start right up. It never stalled when I would try to troubleshoot at the house, even after idling for a long time. This sequence would happen every time I would take the car for a drive. In the interim I had checked for things like leaks in the turbo plumbing and checked/fixed what would turn out to be unrelated matters in the electrical/ignition systems. Both fuel pumps hummed along. I finally took it into a shop a few weeks ago where I know the owner is a RWD Brick guru, where it stayed for almost a month. He would check it out in between working on his usual business. Initially the same thing. It would stall after driving a number of miles, then restart before any fault could be found. He also checked/fixed things that ended up being not being diagnostic when in the shop; e.g., fuel pressure, impulse sender output, FI computer. He even took it home and one time went for a 20 mile drive before it stalled, then started right up again after coming to a stop. The last time, he drove it with a fuel pressure gauge and power train monitor attached to the car and detected a fuel pressure loss right when the engine died; he also noticed an overheated fuel pump relay at the time (the relay in the car was relatively new because I had replaced it during my attempted fixes). The fuel pressure measured fine earlier when checked at the shop with car idling. His conclusion was a defective fuel pump that only acted up after being driven for a relatively long distance, causing the relay to overheat. New fuel pump and new relay and the car seems to be running fine again. Hopefully, that's it. I'm now back to the cosmetic fixes that I started on before this came along and feeling better about the car.
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