[j cAT]

Originally Posted by coachcoffy

I have an 85 T/A ,305 TPI, the motors been rebuilt,has 2000 miles on it,all sensors on motor are new,we've checked timing,it's exact,it starts,run a little rich and rough,but it smoothes out a little.you can drive it slow as long as you don't accelerate, You try to accelerate it cuts out,back fires. I've tested the ignition module & pick up coil,& as I said the knock sensor,map sensor are new, I'm at a stand still,all new plugs,wires,distributor cap & rotor,Please does anyone have any advice or ideas,

what is the back pressure ? I would open the exhaust up stream of the cat converter see if it runs better. what about the heat riser that open ?

fuel evap valves working properly these can suck extra fuel into the engine and melt down the converters.

EGR replaced the last 10 yrs ?