Ok I have a 98 z28 camaro with long tube headers, cat delete, off road y pipe, magnaflow cat back, electric cut out, k&n intake, ported throttle body, ls6 intake with egr adapter, granitelli maf, and slp underdrive pulley. I had everything done but the intake, manifold, throttle body, electric cut out and underdrive pulley already done when i bought the car and it run amazing. After I did those five things the car actually got slower and I also got a check engine light on. I then ran the codes and came up with P0101 which is a MAF code, P0108 which is a MAP code, and P0121 which is tps. I have replaced the tps and put the stock maf on so I am pretty sure that its not the actual sensors and it kind of needs a good tune now. I am wondering if you think a tune can help me out with those things or if there are some other things i can try or if anyone has even ever heard of something like this. I am also kind of curious what everyone thinks i might put down to the rear wheels once i get this running the way it should. Well at this point any help would be great. Thank you all so much for taking some time out of your day to help me its very awsome of you.

 

T T T

 

I would try tuning it. The extra air prob. is throwing off your afr.

 

+1 iIwould like to know to.
Is it safe driving with these codes or will it affect performance or drivability?
I got the same codes(p0101 & p0121)after cam,header,intake install