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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.The code P0202 could indelicate you may have a valve timing concern, so that needs to be addressed first. That would also cause a low vacuum reading, I would recheck the cam timing and then clear the codes and see if any return. Check this and post back with the results and we can work from there.
Yes a valve cover that not sealing would be an unmetered leak and this could set a code. Any air that enters the engine with out coming through the MAF sensor will set codes.