I have a 1994 Camaro Z28 with stock automatic trans that will stall in any gear when coasting. At 75 MPH in Overdrive it will stall if I'm not on the gas. If I manually shift down to Drive, it will not stall until I hit 50 MPH or less. If I manually shift down to 2nd, it will not stall until I hit 0 MPH. It will never stall in Neutral. It does not stall every time, but will stall more frequently the farther I drive. The stalling begins at around the 40 mile mark. After 75 miles, it will begin to stall even from a dead stop at a green light. It will always re-start if I shift to neutral and turn the key. It all began just after 400 miles on a trans re-build. The trans guy replaced the lock-out switch, and it was fine for another 400 miles and began again. He swears it has nothing to do with the trans. I replaced the fuel filter. Anybody have this happen to them?