Your fuel pressure regulator could be stuck closed. Your computer should adjust the injector pulse width to fix it though, but it might be worth checking out since all you have to do is pull the vacuum line off of it and watch the fuel pressure. It should go up. If it doesn't it is either stuck closed or your return line is clogged.
I would still get a tune up though, it could help. Engines with that amount of mileage on them could easily be worn enough to have poor effeciency.
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04 Cobra
densecharger CAI
BBK off road X pipe
Custom Electronic Exhaust cut outs
Tuning via Diablo Predator
Ported and polished Throttle body and plenum
Line locker (for the smoke shows)
Stock boost
412 rwhp 379 rwtq
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