car misfiring bad

[Infiltrate2000]

car misfire badly after 3k rpm, car basically stop dead in it track until u let go of the gas and then gas it again or shift to another gear. I changed the spark plugs and wires two days ago, but it did not help.

So car is running either rich or lean, because it make a popping noise very often when i shift.

I know of the following problems already, bov does not recirculates, its an apexi, has no recirculation kit. Exhuast have a leak on downpipe or next to it. But i don't think this can make the car misfire so bad, let me know what you guys think.

 

[Lunch_Box]

Your car obvisouly isn't stock so what do you have done? And update your profile.

 

[Infiltrate2000]

The car is basically stock except for apexi bov and exhaust which is 2.5 inch. Running stock boost, stock clutch, stock fuel etc.

 

[oldman]

I know of the following problems already, bov does not recirculates, its an apexi, has no recirculation kit. Exhuast have a leak on downpipe or next to it. But i don't think this can make the car misfire so bad, let me know what you guys think.

Probably not by itself but add boost leaks to that and you got problems. I suggest performing a leak test and replace the BOV with something that can be recirculated, that or upgrade to a blow through setup.