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ok with the engine running if you have tail pipes you can get to place a piece of regular printer paper over the tail pipe holding it firm but not as to close off the exhaust - if the motor has a miss it will make a slapping sound if you are not sure about the sound i am talking about remove a plug wire re start with it missing and do it again you will hear the sound -- if its a solid the valve adjustment will show a lobe right away one will be way loose if its hyd lifters use a small T style steel rule and measure the compression of the springs from the side wheir the slapping noise is -- more work but before taking it apart you can see if it is a lobe going away -- 20 / 25 thousands diff is a worn out cam and a mushroomed lifter not much -- but be sure its not in the ignition especially since you changed some stuff and now are having a problem - the china **** they sell today is junk -- be sure jz
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