When you did the repair, you had to take off the valvetronics. Hopefully you marked them how they were positioned. When you re-installed them, they should go in the same position. And left to left right to right.
before starting the engine, the next step is to re-learn the valvetronics position. You should hear them whirring. if you didn't do that, the camshaft gets misaligned, hopefully you didn't do any extensive damage.
Try resetting the valvetronics. If the issue persists, you might have damaged a few components of the engine. Also, if you followed the proper procedure of removing/installing the valvetronics, then there is something else and disregard my comments.

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Stable: e92is, e46 M54B25, e83 N52, e53 N62 - sold, e39 M54B30 R.I.P.