i have had this problem for the past 2 months, i have just installed new exhaust, level 2 clutch and 8lb flywheel compared to the 22lb stock i changed out the spark plugs that were crap and ever since then the engine light will flash for 10 sec and go away, the next day it will come on solid while im driving il check the codes and it comes up with engine misfires and it changes everytime i check. 2-3days later the light goes away i got a diagnostics test on wed but I think its the flywheel spinning a lot faster than the computer thinks it should b spinning and the added exhaust flow prob doesnt help that so I'm thinking the computer has to train itself or do i have a problem here

thanks