My cars ticking over very wierd. The exhaust is popping and making the car shake, when you rev it it's fine until the revs settle down to idle and then it feels like it's going to stall. Also when I change gear the revs rise.(but this may of been due to the car still being cold)
I've recently changed my exhaust from standard to a middle stainless centre section with a cetre silencer and a mild steel gt3 back box which is crap in my opinion because if doesn't fit right and makes a drowning noise.
So what's the best thing to do to try and cure the problem?