Hey guys, I'm getting these codes >>> KOEO (511) , CM (157, 212), KEOR (159) Iirc, the 511 code is because I have a SCT chip. MY car is a 95 GT, 5spd, 393 stroker, no egr, no smog (both turned off with the chip. Trick Flow 351 upper/lower intake, TF Stage-1 cam, 80mm TB, PRO-M 80 massair meter cal'd for the 30# injectors. The SCT chip is a mail order ship from JMS. The car ran awesome for a week or two after I installed the new chip... then started acting up & has gotten progressively worse over the past 6months (It's a weekend car so I don't drive it much). Cold start up is extremely rich, 10-11 on my wide band, surges really bad for 30 seconds or so, then smooths out, although still running very rich. After it warms up, it idles pretty good, A/F stays in the 14's, but if I try to run the A/C at idle/in town traffic, it will stall when I come to a stop. Low rpms/light throttle/parking lot driving, is really crappy... it surges/bucks at low speeds, ONLY when in gear, but if I'm just coasting, it idles fine. The other issue it has is when cruising 65mph+ in 5th under 2,200 rpms or so, for long periods of time, the A/F stays right at 14.7 +/- .02... then totally at random, it will momentarily go really lean (pegs the wife band @16.0 for a sec), cut's out, the comes back & is fine.... weird. I'ts totally random, like maybe once or twice in a 150+ mile round trip. Iirc, the "511" code is because of the chip. Idk what the 212 is from, I haven't touched the spout connector since I cleared the codes last, so I could drive it to see what new codes it would hold, that one beats me. Does the 157 & 159 sound like a bad mass air meter? I've had these issues for at least 6months now, but having gotten married this last year, life has changed alot from being single & my work schedule has changed as well so I haven't had the time to really mess with it, just drive it occasionally. A few months back, I was having these issues & I pulled the plug on the mass air to see if it changed any, it ran exactly the same, regardless if the mass air was plugged in or not. I cleared the codes after I did that & have been driving it here & there for the past couple months, so I could check the codes again. Any help or ideas would be appreciated. Thanks, Joe.