I've been having a TON of problems with my LE2 350 as of recently. I got a new PCM tune maybe a week ago. Car ran great, idled perfect, no smoking, etc. Now maybe after 15 miles of driving, I go to take it for a ride today and all of a sudden it fouls plugs, has gas in the oil, and smokes like a chimney (so, it's running REALLY rich). I honestly have no clue where to start, I know it's not the tune because it did this before the tune also, and I was hoping the tune would fix it. I have Accel 30# injectors so I know it's no overkill. What could be causing this? I have brand new AC Delco O2 Sensors, so it's not that. I'm this ---> <---- close to completely giving up on this motor, it's been giving me nothing but problems since day one. Any help at this point is good help, thanks guys!

 

More than one person has found Accels to be missmarked, they really sold crappy injectors for a long time. Word is they are correcting the problem but who knows how much old stock is out there.

Just one idea to look into, in no way a diagnosis.

 

Possible, but can't see how that would make it run pig rich, unless maybe they were mismarked and are actually 36+ lb injectors. Maybe I'll send 'em off to get tested. Thanks for the help! Keep the suggestions coming!