I have a 99 grand am gt w/ swapped 3.5L engine. My car is doing what I can only describe as flat lining when I decelerate(mainly from highway speeds). I can be doing about 34mph, decelerate and the engine stumbles dropping to 600rpm for about one second. During flat line fuel trims run 0.0, my wideband goes 22.0, and injector pulse zeroes out too. I've had this problem for a while now, but I have attempted fixing the problem before. In my attached scan you can find it right after the 6600 frames, then I flick the pedal to make it respond again.
P.S. How should I adjust for KR with a limited parameter setup like the GA?
Thanks for checking this out