Diagnostic question

There is no such thing as a running compression check. Normally to save money have a mechanic check this out as it can be a bad or weak sensor or a basic engine problem you have already spent over $100.00 for parts that are probably good. The mechanic can check sensor voltage and a few other things with his scanner that you cannot to diagnose the problem. The engine in your car does not fail camshafts that often like rarely as they are steel billet a lifter can collapse, push rod break or valve spring break. If you want pull the valve cover off and spin engine over see if you can see any of this. But I always advise to go to a mechanic to save money strange as it seems especially with misfires as they are very hard to diagnose now a days.

It will no't be a lower end issue if you are thinking a rod bearing etc. More than likely push rod/valve spring something like that.