2001 20 vw beetle engine managmemt light keeps comming on told it was misfire on no4 all new plugs light reset run for three days light back on HELP

Certainly the person telling you this had a scan tool but did not investigate thoroughly why it was misfiring and only suggested a bad plug in cyl #4. A bad plug is usually the case maybe from a mixed matched set of plugs. Having a distributor-less system some people miss to check the ignition coil pack. Technically you can't correct a problem by resetting it's warning indicator which some people think they have a red FIX button. In this case the engine management needed 3 start up cycles to verify if problem was fixed after erasing the DTC stored in the system, hence the 3 days. The ignition coil pack could be going bad or the individual ignition wire is. Is this an AEG engine code?