ok so my check engine light comes on for a week then turns off for a day then is back on. When I accelerate I can only boost about 4 psi. its been doing this for about a month. It fixed itself for about two weeks and just started doing it again. I had the code read and it said that my MAP sensor was bad. so I replaced it. ( did not fix the problem ) then It said my MAF sensor was bad so I replaced it ( did not fix the problem ) now its saying that my SCIP is bad and I cannot find it anywhere for sale. Not even the dealer has it. can anyone help?