I recently bought a 92 RS 305 tbi, with some aftermarket add ons(cam, headers)the usual stuff. When I was driving it home it wanted to cut out at 3 grand. I checked the ecm but no codes. So I swapped the IAC,Fuel Meter, made sure everything was functioning right. Then I remembered that the last owner told me that he had a performance chip installed. I ordered a new e prom and installed it. Since then the car has ran like it should.