Hey guys I really need help. I have a 00' si with a b16b swap, J's racing intake,catback exhaust and header. recently while holding a steady speed or just lightly letting off of the throttle my car buck like it was running out of gas.
I have tried every thing I know so far by swapping plugs, wires, cap and button,and a new fuel pump. These things have not remedied the problem.
Has anyone else had this going on? All help is appreciated.

Larry

 

does it happen at all rpms or just in a certain range? Is it ONLY when you let off the gas and leave the clutch engaged? If the clutch is still engaged, it may be a slippage problem, but iono. If the engine stutters only within a certain rpm range, you could be missing. Could also be a problem with the throttle sticking. could be a million things. any more specific info?

 

It doesn't do it all the time. Never at idle only on the interstate driving around 80mph. It will do it in lower gears but the clutch is strong. It is almost like- say you are in 2nd gear and you tap the gas real quick like. I am starting to think it could be the ignition coil or a leak in the intake.

 

Anybody?

 

ignition timing perhaps.