I have the idle tuned. sits around 900rpm and 14/1 AFR.Put it in gear, all good. drive it down the road, no boost. stop at the stop sign, never really dropped below 13/1 AFR, so far so good. at the stop sign it goes back to around 14/1. Now I drive forward, cruise down the road. I mash the pedal, it goes to 12/1, under 8lbs boost, all good. now I let off the pedal, slowly come to the stop sign and the AFR leans out(18-20AFR), rpms drop, and it dies. I start it back up and it wont idle( its staying lean). I have to keep my foot on the gas to keep it running. I start to go again and giving it light throttle the AFR hit 9.9 and stays unless I mash the gas again or let off the gas. It doesnt run anything like it did before it saw boost. now matter what i change, it doesnt seem to change anything. The only thing I can think of that would make it run that erratic is a bad maf. Any suggestions??

I have a stock 350 with a 87 tpi setup, holley throttle body, #42 inj, 255 walbro FP, custom twin turbo setup, large intercooler, maf is now inside a 3 in pipe.
here is the bin Im using https://www.thirdgen.org/forums/diy-...-way-rich.html