Hi, just had new 263 cams fitted and now have iffy running motor. Symptoms are below 1500 rpm occasional cough, normally low gear and need to accelerate hard from 1k to get it to do it. other is what seems like over run, accelerate and lift off it has trouble dropping revs, takes a couple of seconds to drop to about 800, not the usual 650-700. Have cleaned throttle body, vag com shows no errors and tps reset. Does it take time to learn new fuel air mixture? Unplug tps and engine seems to run correctly ie revs drop like a stone to burble about 650. Suggestions please! Thanks for taking time to