my 7.3 is knocking.

73idi88f350

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now ive only owned this truck for a few months now.. already done head gaskets.. the mileage is suppose to be 160k( the guy i bought it from said it turned once)

it is a 88 f350 manual trans 7.3 idi

now i have this random knocking that sounds like a rod is loose but intermittent.. its not there when first started and then after ran for say 2-3 min and you rev it, it knocks..

also noticed it only seems to be between 1700-2200 rpms

it don't knock when cruising with a load on the engine, like driving at a consistent speed unless your between the rpm range.. but if i down shift and use the engine to brake it knocks but some time it dont do it..

the ip pump and injectors is unknown ( i assume there oem)

i wonder if the clutch is messed up or the dual mass fly wheel is damaged?

looking for opinions before i decide to find another engine.
 

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