Help! after cam timing

[Fred111]

My 02 Boxster had the scavenge pump on bank 1 sieze and cause the camshafts to jump time. I replaced the pump and gear and re-timed the cams. All looked good putting it back together. It started up fine and sounded fine then the cel came on. I get codes P0300, 301,202, 303. (All misfires on cyl 1-3) I can let it idle and the cel will come on flashing for maybe 15 seconds and it sounds like there is a misfire. The light will go off by itself and the idle smoothes out. This repeats every 15-30 seconds. If I rev up to 2-3000 rpm the light usually comes on and then will go off again by itself after several seconds. I have a Durametric but i’m not sure what to check. The variocam system seems to be working fine on both banks. Anybody have any ideas? Thanks!