everyday in the morning, if i dont let the car run idle for about 3 mins(if i start the car and drive after few seconds) on first gear the car jerks if i let go of the gas it feels like misfires for few seconds but after 5 mins of drive the car is normal, do your guys think its one of the spark plugs and also before i didnt have resonator on, when i started the car and rev the motor to 3-4k rpm it would back fire (pop like a gun shot almost lol) when i start the car in the morning. but after 5-10 mins of driving it wouldnt backfire?

 

Just from reading the stickies, I think the CEL should flash if you're misfiring. Are you getting any of that?

 

i have a CEL from the testpipe, that reads as bad Cat, you think that would do it?

 

Its because you have no cat and the sai is still on dumping more fuel in the engine to warm up the cat that isnt there. The extra gas is going out the exhaust and then the heat from it ignites it in your exhaust causing you to backfire.

 

ok i get the backfire but howbout the jerking like the car is almostgoing to stop running on first gear in first few minutes of drive.