I started to have stalling issues a few months ago on my MK4 1999.5 Golf. Originally I thought it was the air filter, since I had the same behavior a year before and a clean air filter did the trick. However this time it did not fix the problem.
The car will sometimes stall when idling or when coming to a stop. It seems worse the more humid / hot it is outside.
So I started thinking it was the MAF. Someone suggested disconnecting it to see - and when I do so the car runs crappy (and throws a CEL) but does not stall. So that seemed to me it was the MAF. I hooked up the MAF again and waited for the CEL to shut off. When I did I hit autozone and read the two codes from the car's computer:
P0102 - MAF circuit low voltage P0112 - IAT circuit low voltage
So I figured the MAF code was the tell tale sign to get a new MAF. I went and grabbed one from the dealer and popped it in. But I'm still stalling and it seems even worse than before. The good standby of unplugging the MAF and running rich still stops the stalling problems.
So I guess it's not the MAF (or I got a bad one from the dealer). Does anyone have any ideas before I give up and take it in? Is the P0112 code a hint (what does that mean?).
Thanks for the help!
-Pete