What is the most likelty cause to lose injector signal on a 1995 GMC TBI Suburban if the fuel pump and ignition module are both new and the motor starts up if primed but will not continue running?

The most likely cause is a bad crankshaft position sensor. Does the vehicle have a tachometer? If it does, crank the engine over while watching the tach.

If the tach doesn't read atleast 200-300 RPM while cranking you have lost crank signal and the crankshaft position sensor would be the most likely problem. But check the wires and connector as well. The sensor could be okay but a bad wire or connection would cause the same problem.

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