B
BSLAVIK
Guest
I have a 1992 w/auto trans Lt1 and have been chasing around a hesitation and backfireing problem for a month or more now? I have noticed that it runs really good cold at start up, and then as it warms it missfires and stumbles at take off, it seems to run ok at 55-65 mph though? I have installed new o2 sensors and spark plugs and have not cured the problem? I did find out that if I leave the o2 sensor leads unplugged that it is at least driveable? however the check engine light comes on after warm up. I have also added injector cleaner the last two fills and that hasn't changed anything either, I have also checked for vaccum leaks and haven't found any yet. my next area to check will be the egr system, any ideas on how best to diagnose the egr system would be helpful.
