Ive suspected something is up with my corrado for a little while and I have changed numerous parts to cure the niggle. The problem is that while the idle is steady its not silky smooth as it was a few months back, ive also noticed a slight pop when reved to just over 2000 rpm from the exhaust. I dont recall this before. I have had the diagnostics checked with no faults, ive had the coil pack, Ht leads, cam sensor, engine speed sensor, spark plugs, head gasket and water pump changed in the several months leading up to this. Has anyone had a similar problem? Cheers.