I had a similar issue with mine and after adjusting the valves yesterday it has smoothed out considerably. What I discovered is that four intakes and an exhaust valve were way to tight which even seemed to cause minor collisions between a piston and valve until it warmed up. A horrible sound at best !
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78 300d 158k driver
80 300d 200k fixer
80 300d parts car
98 Cherokee 240k
" I know for certain that someday while parking or un-parking my Jeep Cherokee, I'm gonna' either pull the headlight switch right outa' its dashboard OR stomp its hood release lever clean offa' the kick panel. It's just a matter of which will happen first."
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