i have a 1992 firebird 350 tbi, the rpm's are low, it idle's inconsistently, and when i pop it in reverse it sometimes turns off, and also when i am driving at low speeds 5mph etc and it surges when i'm at a red light...and i already cleaned the tbi, and i cleaned the idle air control valve, i also changed the spark plug's and the cables, i flushed the radiator, i checked for anything loose!...so i am completley lost!.
a mechanic that i ran into told me that it might be the computer? he didnt look at my car, it was only verbal. well the previous owner swapped the 305 for a 350, and i wonder if i need to change the prom???? or something down there? well i would appreciate any advice i can get, i will try anything at this point,
thanks for your help!-jorge :hail:

 

I kinda had te same problem with my old S-10 blazer It had originally a 4.3 v-6 then he put a 305 in it just before i bought it I have no clue how he did it But every once in a while it would stall out or run a lil rough i'd just shut it off and start it again and it worked fine. I dunno if he used the same computer but it worked fine just every once in a while it would do the same thing

 

you might try hooking up a scanner of some sort, to see what the computer is seeing. chances are if he put a 350 in and did no chip work, taht is where the problem is, but you won't really know until you see what the computer see's.

 

Too rich and too much timing?

 

well, i took it to get it checked out, and the guy ended up putting it on the scanner, then he got a malet and a screw driver and put the screwdriver in a whole on the front of the tbi, then he turned it clockwise, and then he told me to try it out and it felt like new! i slammed it hard for about 15 minutes, i changed gears, slammed it on reverse and it worked like new! so i guess it was a timing adjustment!, its amazing how simple things can screw up your ride big time!, well i wanna thank all you guys for hooking me up! i really appreciate it! :rockon: