Ok, I did my motor swap about 4-5 months ago... I went from a 305 tbi to a 350 tbi... I changed the knock sensor, computer, injectors, and prom... It still didnt run fine... It ran rich, this is with everything i needed to change changed... Ok, so then I am like, hmm maybe if I put the stock 305 computer back in, it wont run rich. Well, I put the stock 305 computer in, also the stock 305 prom, with the 350 injectors and the 350 knock sensor, and whadda ya know. It still runs rich as a freakin gas pump... I tryed this combo as well, using my 305 computer and 350 prom, but my check engine light kept constantly flashing... So that didn't work either... Any help is appereciated, its been months since I did this swap and it still isnt running like it should... I am tired of smelling like gasonline and having to stop at every gas station I see... Someone please help me...

 

You did change to the entire 350 ecm/prom?

How's your fuel pressure? Do you have a free flowing exhaust? How is your coolant temp sensor? O2 sensor?

 

I did change the computer/ecm, and that didnt fix anything... Yes, I installed headers, y pipe, 80 series flowmaster, 3 inch all the way back... I wired up my O2 sensor, and changed the coolant temp sensor...

 

Is the TBI 350 Stock? Timing set correctly? Fuel pressure in the 12-14 PSI range? MAP Sensor and Coolant Temperature Sensor hooked up and operating OK?

 

Yes its the stock 350 tbi, i havent checked my fuel pressure, my MAP and coolant temp sensors are both working fine... And yes my timing is set fine