Im wondering what cauzes misfiring because i heard it could be the EGR valve but mine has a block off plate and my car still misfires at idle and when i rev it.

 

bad plugs, bad coils, bad anything ingition related, too lean, too rich, bad ecu, vacume leak, bad tps, poorly set tps(maybe, more liky just a bouncing idle), water in teh gas tank, many many many more things

 

ight thanks i may check my tps

 

No havent you seen Initial D.

Our FC's come with a misfiring system that make us mAd Qw1K y0

Most FC's do it but I am sure it is not supposed to happen if all your emmisions stuff is on and working properly.

 

well my egr is bloked off and cats are gutted id figure it would run smotther if it had no emmisions i dont see how no emmisions would be rughper thatn emmissions

 

Do new wires and plugs first. My experience with cars has taught me that plugs and wires are the biggest cause of simple problems like that...get them replaced when needed, or even do plugs a bit more often then needed. Then do the stuff like TPS and checking the coils and stuff.

 

It's due to a slight redistribution of exhaust getting back Into the next cycle. This could be due to being to rich, poor sparking, sealing. etc