In early March '11, I purchased an '89 Corvette. It ran fine until Easter Sunday and that’s the last day I’ve been able to drive it. I’ve had it in the shop two times in the last month because it will stall without any warning. The first attempt to fix it, the shop did a “major” tune-up, replacing the spark plugs & wires, the ignition coil, the cap & rotor, and the in-line fuel filter. This didn’t cure the problem, so about 2 weeks ago, I put it in the shop again. This time, they made sure that all the previous work was done correctly. It was, but the car still had the same issue. So, they attempted to diagnose the problem by swapping out the ignition module, spark control module, and even the ECM. This didn’t work either. After having the car more than a week, they finally ended up replacing the whole distributor assembly and declared the problem solved. It wasn’t. On the way home from the shop, it stalled again. I had to have it towed home and it’s been sitting in the driveway ever since. While they had it, they did discover that the #6 injector wasn’t working. So, last weekend, I replaced that myself. That didn’t cure the problem either. In fact, after doing the repair, it idles rougher now than it did before, and it still “died” about 10 minutes after getting it running. I’ve even checked all the ground-wire junction blocks under the hood, thinking it might be a loose connection. Through all of this, it has never set any fault codes in the computer’s memory.
Anybody have any other ideas? It doesn’t seem to matter whether it’s sitting in the driveway at idle, or out on the street. It can run 5 minutes before stalling, or several hours. There’s no rhyme or reason to when it does it and I’ve got 44 lbs. of fuel pressure at the rail when it does this. Normal pressure is supposed to be between 40 and 45 lbs.