Suddenly lean?

[bobbo]

Hey guys! I thought I'd post the question and see what people think.
The car was tuned PROPERLY with a PFC with solid A/Fs and ran great. Now suddenly I'm running a little lean.
I've gone from ~14.7 idle to ~15.0 and from 11.8ish to ~12.4 at wot.
I did install a hard pipe kit but I'm pretty sure the issue started before that. I've gone through my install and can't find a leak.
I'm suspecting my fuel pump is getting tired. The car was tuned off of the w/b so I don't think it's the MAFs. The values appear within spec on them anyway... I think.
Your thoughts?
Thanks!

[Skym]

Also check FPR, as they are known to fail. To check fuelpump, FPR (pull vacuum hose off FPR and block hose, nipple on intake plenum. Fuel pressure should rise 7.1 psi or so. That's above the factory 35.5 psi with vacuum hose connected at idle), check fuel pressure inbetween fuel rail, fuel filter. Sometimes fuel filter is blocked or faulty and use a factory fuel filter or high quality fuel filter.

[bobbo]

Thanks Skym! I'll get a FP gauge and try that.