My 2001 S3 AMK has been giving me troubles over the last few months. Previously it was randomly misfiring, so on advice from the forum, I've checked for vac leaks and fixed the coil wiring. I've fixed a split pipe and replaced the thermostat, temp sender, and had a known working set of plugs/coils fitted. After all this my misfires only seem to happen now when the engine is at less than 90deg C temp or when @ 90 under WOT. I assume that I still have a VAC/Boost leak. What should I check? Also what blocks should I monitor in VCDS/VAG COM to aid in diagnosis. Any help is appreciated.