A little smoke. valves or seats?

branman444

New Member
Feb 10, 2007
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I think i have some problems creepen up on me.
If I let my car sit running for a minute or 2 when i hit the gas it blows a little puff of blue/gray smoke out the passenger side pipe. Its not doing it while driving at all even at hi or hard pulls.
I am thinking valve guide or seat. What do you guys think.

Next thing is what would be the best thing to do to it?
Valve job, new heads, .....

Its a '02 GT 4.6 with 120k+ miles. I drive this car a lot. 100K in the last 2.5 years.
Thanks,