ca18det running bad...

[da_grey_s13]

ok, about 2 months ago i replaced the clutch, test pipe, intercooler and piping on my ca18. it ran fine boosting 14psi and was fast as shit before i replaced this stuff. after putting that in, the car misfires under full throttle, like it has a clogged catalytic convertor, but will tach up fine to 6500 and make 14psi when done slowly. i thought my piping was too small on the cold side but we changed to bigger piping and is still does it.

I think it may be either the fuel filter, MAFS, ecu or timing.(none of which were tampered with during the above installs)

Also, the only factors that have changed since are the air temp, since it's about 30 degrees colder here since it ran good; and i think my old school hks BOV has a worn out spring now.

Someone please try to point me in the right direction on fixing this...