Hi I have a 1984 GN TT Chip 42lb injectors Bosch 237 FPR and a Walbro pump. I got a reman Napa MAF that I suspect may be the problem. It worked fine at first though. Car is really lean and then rich when I hit the gas when stumbling and leans right back out. Can't even put the car in drive, it'll die! I just got a Powerlogger and took a snapshot when it was stumbling at it worst (attached). No trouble codes. Please any advice. Thanks!