Where is fuel filter
fuel filter has to be changed every 8000 miles or sooner if it plugsup sooner
I would start with replacing the fuel filter if you haven't already done so. Then check the fuel pump.
The ECM on the Vandura 2500 is under the Driver's seat.
Its in the carb ,where the gas line connects.
I bought a set of GMC shop manuals off ebay for $40. It comes with the fuel system book, wiring diagrams, light duty trucks and vandura and rally book. They have saved me on a lot of labor $$$ having them.
My 93' vandura has a 5.7 liter 350cubic inch engine.
crack in the electronic coil ,when it gets hot it will expand and ark and kill the engine