I've been trying to troubleshoot a friends 2000 vw beetle 1.8t that was running very rough upon acceleration,and yesterday new plugs were installed,also a gas cap and fuel filter by someone else. the code shows a PO445. Now after that was done it seems to be missing on the #2 cylinder.I checked by pulling each fuel injector wire clip one at a time to try and locate which cylinder.#2 made no difference while running when pulled injector clip. would that be more likely to be a bad injector? Or could it be something else like a coil pack? Thank you much!!