this truck has 365,000 and a hell of a miss at right around 2000 rpm popping,white smoke a guy wants me to run the overhead and look at it to see whats wrong with it he figures me runnning the overhead will fix it i am thinking a set of injectors because when i cracked the line on all of them #5 it doesnt even begin to miss at an idle and this is definatly a ranch rig so its still original i think if theres any more ideas would like to hear them

 

check valve clearnce, timing,

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but it does sound fuel related

 

Broken spring in the head or pump or injector?

 

Id say check FP and if it checks out then id say it dropped an injector. Thats alot of miles, like said, Adjust valves too. it prob wouldnt hurt