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I have a '95 k2500 with a '78 model 350 installed. My truck will crank fine and drives ok-ish. (Tends to bog a little in bottom end causing excess gas to be used.) But anyways, my truck will crank just fine and I will accelerate to leave my driveway, and it will go as planned, and then it stalls suddenly and i can feel tension in the gas pedal drop. I can hear a pop/thud on the other side of the firewall (almost like it backfires) and just as quick as it stalls, it picks up again and drives just as usual. (Happens within seconds) The man i bought the truck from disconnected the service engine light in dash due to the truck having no 02 sensors (causing the light to stay on), so I have no clue as to if it is throwing a code or not. Truck used to run like a champ before this started happening. Ive replaced: Plugs/wires, coil,distributor,EGR valve and EGR solenoid, MAP sensor, TPS sensor, IAC sensor, Injectors, rebuilt the TBI and replaced gaskets, Intake gasket, Timing chain (due to a skipped tooth), Fuel Pump, fuel pump relay, both temp sensors (one in head and one by thermostat), and i believe thats all. Im at a loss here. Checked for vacuum leaks and can't find anything. Please Help!
Timing mark on the timing cover is broke off and but i still have the other half thats welded to the cover to refernce. I believe i have it set though. but ill continue to tweak and see if that makes a difference. I replaced the TPS Sensor because it was under warranty and that didn't seem to make a difference. It is kinda sluggish in the bottom end before it thuds. so maybe timing is the issue? Ill let you know what comes of it. What doesn't make sense is that it only thuds once and it always happens after my first initial take off from cranking the truck.
See engine emissions decal for proper ignition timing proceedure if original type distributor is in the engine! .. Got to disconnect the timing connector on passenger side firewall best I can remember, before setting timing... Been a while since I tuned up a 95.