The truck is a 1988 Chevy 3500 1 ton pickup with a 350ci. It would sometimes idle fine, and other times the idle would jump up and down and die if you didnt hold the brake and gas at the same time, it is an ex-state truck so i know it spent a lot of it's time idleing on the side of the road(only 40K original miles), the problem has been steadily getting worse until yesterday when it wouldent even start, i took a shot in the dark and bought a TPS, which didnt help. Then i hooked it to a home scan-tool and it said there is no signal from the distributor to the ECM, so i bought a hall effect sensor(in the dist.) tonight and that didn't make a speck of difference either, it has fuel spraying out the injectors(2 of em on top of the intake) and spark from the coil, (not sure about spark from the distributor), any help would be GREATLY appreciated, even a shot in the dark could solve the situation, it has been an ongoing problem since we bought the truck a coulpe years ago and it just got worse, but this is the first time it wouldent start, Thanks
~Mark~
~Mark~