Originally Posted by juanmedina
What CAI are you running? Blow through?
These were my first two questions. If it is not blow through, that is a bonus, but if the MAF is on a funky angle, or just coming off a corner, that will most certainly affect the way it is reading. Is the MAF dirty?
How are you tuned? Open source?
If you're tuned w/ a cobb, you should consider speed density to see if that is part of the problem. There is a setting on there where it blends the two so you dont have to retune right away, but it doesn't sounds like getting a modified tune is a problem for you.
Sure enough put a fuel pressure gauge on it and it is dropping from about 62psi back to 55psi in the upper RPM range...so another problem...grrrreat.
No vacuum leak? What about bad MAP sensor? Not a common fail point but ... never know. Simple enough to check