[ktscott1]

I have a 1995 chevy blazer s-10, 4.3 Vortec CMFI 4X4 that i purchased about a year ago, my son drove it for about 8 months, then it started bogging down & had a miss in it, i took it to auto zone to have the codes read, the engine light will blink when started then go on steady, they advised i had a miss in cylinder 4 & a bad 02 Censor, When i purchased the vehicle i replace the Distributor, rotor, cap, plugs, wires, was running good, then the engine light came on, took it to auto zone, they advised the 02 sensor, Throttle position sensor, miss in cylinder 4, replaced the Throttle Pos Sensor, had a mechanic look at it, he advised was the Spider Assembly, recently replaced that & added a new fuel pump & fuel filter, now the truck will only start when i use starting fluid, after it's running it doesn't stall, but if you try to rev the rpm's up past 2 to 3 thousand, it sounds like it is backfiring. Also I have removed the catalytic converter. I have had a ton of back surgeries & tired of spending a ton of money on mechanics, does anyone have any idea's on this damn thing? any help would be greatlt appreciated.