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Hello, I will try my best to help you with your concern.
Is the check engine light on?
You said it was missing, is it still missing?
when did the problem actually start?
after what part of the repair?
if you have replaced all the ignition items with good quality parts then the next step is to check the engine compression.
weak compression will affect all the things you have described
a weak cylinder might only show itself more when it is at idle.
also the timing belt needs to be rechecked to make sure it is not off time.
also make sure the maf sensor is not dirty. you should go ahead a clean it with the proper cleaner