odd Idle/ stall at stops and weird a/f readings on wide band

Ill start from the beginning. I have had my car stall out after doing heavy acceleration and coming to a stop and sometimes. It doesn't do it as much if I don't get on it but its like a 50/50 chance. Sometimes it even does it when at idle it will sound like its going to die then doesn't then sometimes does. Later tonight leaving a buddy's house I was driving and it seemed to be acting kinda weird. I was on the freeway doing 70 mph steadily and my wide band was saying used to read between 13.7-13.5 at partial throttle then it goes to 10:0 and it's never went that rich before then I push full throttle and it will lean out. I am running 370cc injectors at 44 psi vac off ,I am using the sr20ve maf and sr16ve ecu. I had it running at idle and the wide band was reading 13:1. I checked all the vac lines and they are solid and checked my F/P gauge was reading right. Is it possible my maf is going bad? I unplugged it and then it chugged 2 times then stalled. I unplugged the purple plug from the Acc and didn't effect it at all. Could be the ICV/ACC? Any help would be great.

Thanks

Mitch

It sounds like it could be the IACV, idle air control valve. Pretty common for them to stick. If it starts idling funny, tap the IACV with a screwdriver/wrench and see if the idle changes.

Ok. I will see next time it does it. Thanks.

That or its a vac leak somewhere. My de+t is doing the same thing right now. I did a boost leak test and figured out that there is a vac leak where i have the hose for the iacv conected to. The proper fitting isnt in there. When i drive the air fuel ratio will be fine for a while then jump all over the place, i have the same stalling issues as you also the car likes to idle at 10:1 for a bit on cold start up.

yea I cleaned main sensor with electrical cleaner and fixed a leak between the cold air piping to the maf and haven't had the weird a/r. I still have a a little of idle drop after getting on it but isn't stalling out. I always have had problems when the car is cold.