Sometimes car runs ok but sometimes it runs bad and wont rev past 3000rpms, when its running bad it jerks and acts like its running out of gas at 2800-3000rpms. Then i let up enough to get it to shift and it goes away but still doesnt run good. The next time i drive it might not do it but still doesnt seem to run like it should (maybe a miss?)but runs ok and will rev to red line. Just did plugs, fuel filter, maf sensor and punched out cats(90% sure one was plugged) still does it. Anybody else have similar symptoms?

 

When you changed the plugs did you replace the intake gaskets?
sounds to me like you may have a vacuum leak.
Also what plugs did you use our cats do not like the multi ground electrodes

do you have a check engine light? If so have the codes read and post them here that will point us in the right direction.

 

The engine light has been on since i bought the car but ive tried to pull codes and scanner showed none which makes no sense if the engine light is on

 

Single electrode plugs but didnt do gaskets