Hi i have 92 RS L03 TBI and it seems to have a problem with backfiring and surging when under reasonable thorotle. Ive changed plugs, wires, dizzy cap, ecm, both fuel injectors, fuel pressure regulator,02 sensor and some other suff i cant think of at the moment. And when its cold i have to press down the throttle to start it and keep it running this is only when its cold but when its warmed up it idles at 700 but still surges backfires. The timing is set to 4*BTDC. I have no clue what to do next i thought it was something to do with the fuel but apperantly not? And also sometimes the check engine light will go on but then turn off a few moments later when its on its throwing the 02 sensor code which boggles me because it has a brand new 02 sensor on it...

 

i kinda had the same prob, turned out to be clogged cats
hope that helps

 

cant be clogged cat cause i cut it off :P

 

Have you tested the ignition module? Has the coil been replaced? I had this same problem a couple of months ago. First, the module would test good but kill the coil. Next, the module finally gave way. Even if the module tests good, I'd question it.

 

tested the module today it tested good the backfiring seems to be solved now idk what the problem was but i took apart the whole distributer and cleaned it all now i just need to re time it and shes all good but the problem is idk what to time it at i hink its 0* BTDC but im not sure...