hey guys ive got a problem and really wont to pinpoint what it is. my lt1 is random missing at low rpm not high. i put on some hookers a while back and took off the air pump and pluged the egr and and it shot codes (duh).a couple monthes ago is when the missing started so i put on a new accel opti ad it quit for about 200 miles then started back. my 02s are shot so im not going into closed loop and i when when i pluged a otc scaner in it i think my air fuel was either 13.8 or 13.1 cant remeber but could this be fauling my plugs causeig the low rpm miss or uguys think it could be the opti/module? thanks guys for the input and if any gm lt1 enginers are reading good idea bad design:sad:

it's not a bad design, just not properly tuned.
have you checked the usual things like spark plugs and wires, looked for vacuum leaks, all sensors working properly, etc?

yes replaced wire/plugs and nothing another thing it only does it when its warm and about 2 cylinders never miss.

Too much fuel will cause a misfire.

if it only does it when it's warm, then look at the temp and O2 sensors.