I have a MY00 Classic with a retro fit PPP bought piecemeal and a decat downpipe. The cars idle has become quite lumpy to the point where the car rocks gently when sat at idle. Also when driving and full throttle is applied in 4th or 5th gear there are a couple of hesitations as the revs rise. The hesitations are not there on part throttle.

I'm not sure exactly when this lumpyness started, whether it was when the PPP ecu was fitted or before or even after, it may just be a coincidence.

Any thoughts?