Hi everyone. New to the forum. Hoping someone on here can help me. I have an 86 fiero gt with 4.9 caddy hooked up to 5 spd. It ran fine up till about 3 months ago, and now it starts up, runs for one second and shuts off. It idles low and ran rich for little bit before stopped working. I have replaced isc motor, fuel pump, filter, tps, hall effect sensor, icm, and plugs, and still cant get it to run. Anyone with any advice would be greatly appreciated.