Engine has rough slightly rough idle (2.7) no misfire under load, oil smoke puffs out of valve cover when cap?

Question

when oil cap or breather tube is removed oil smoke puffs from opening, small oil consumption, no smoke from tailpipe, pcv is not blocked. what is possible reason, bad valve seal or sludge blockage in oil return holes,? need suggestions please

Answer 1

yep  that or just old and wore out.. most  like valve seats

Answer 2

d

Answer 3

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http://www.2carpros.com/faq.htm