I just bought a 94 camaro with the 3.4 and have been having the following fuel troubles. According to a tech 1 scan tool the right bank is running rich 148trim and the left is running lean 125 trim. the o2 sensor colaborate this. i pulled the plug on each injector to see if it cauase performance issues and they all did. The map sensor seems to be working fine it threw 3 codes (o2 lean left bank, o2 rich right bank, and dle air controle code) Is it possible for an injector to be leaking but still work well enough to cuase performance decrease when unplugged and if so would it cuase the computer to run the opppisite side lean to meet emmisions or something. Any ideas help im running out of them.

 

Try switching your o2 sensors and see if the sides switch. Once you unplug an injector it stops flow which will cause performance change but a leaking injector will still leak and the performance will still drop but not as much. Still think it would be a o2 problem.