Random lifter rattle

I do believe I figured it out. Went out this morning got my breaker bar and turned the motor and noticed that the intake valve rocker on #3 was really loose could push the rocker and collapse the push rod. So fired up the motor and let it warm up a few minutes, rattled the whole time. Took the valve cover right back off and that lifter hadnt pumped all the way up. All the others were good. Thanks for everyones help.