After doing the Lexus 550 Mod and installing my AFPR I screwed up my AFM (either thanks to K&N oil or Maf cleaner) so when I would try to rev the engine would try to die. I was getting codes 24 and 31. So I've had to drive it with the afm unplugged so that I could at least get it into limp, retard, safe, whatever its called mode, basically i couldnt rev past 2.5k. So I was able to get another AFM from a mechanic and now I'm able to rev my whole range but its still a little rough. While driving the check engine light will come on and the shut off. Also sometimes the engine cuts out almost like i'm hitting fuel cut (mainly in second gear around 1.5k to 2k.) I still get a code 31. What do you guys think is my issue??