I recently purchased my second wrx and when at a light if I go to put it in 1st gear the rpms drop significantly and almost stalls/usually does. If I put the car in neutral it runs fine. The previous owner told me that its the lightweight flywheel causing this but I find that hard to believe. I've cleaned my IACV that I've seen some people say to do and still no improvement. It has brand new sparks, fuel filter, oil, tranny fluid, and a street tune all that I did when I got the car. The tuner said its the worst idle he has seen....Somebody please help!!!!