i'm having the same issue, along with really bad performance--stuttering, backfires, hesitation under 3k RPMs...

so far i've done fuel filter, pvc, O2 sensor, a couple of tanks w/ fuel injector cleaner in them. no CEL. just one day i got in, and it stuttered a little when i started it, and it's ran like crap since. i hope my compression isn't bad...

Custom CAI w/ extra large filter, Front strut tower brace, Rear sway bar, Brembo xDrilled & slotted rotors, Performance Friction pads, Greddy 4:1 header, Greddy SP cat back exhaust, Bridgestone Potenza RE950’s, VIS carbon fiber Hood & pins, Optima Red Top battery, Custom taillights and rear end mod