I would do the test I suggested first, using the crank marks on the carnk pulley and the timing belt cover used when setting igitition timing (with that light). In some cases those marks have been known to be off, but it will still show if one of the cams is off a tooth, and literally takes 5 minutes to do, if that. If thats incomclusive, then I would take the time to pull that cover off, with all of the work that it entails.
