Repairpal.com
Sell your car.
Depends on your location and labor rates. I would suspect ~400-600 for a private mechanic, more at a dealer.
$1000-$1500
arm & a leg
Which plenum-intake or. . . .
if you are going to replace the intake gasket you might as well change the head gaskets at the same time[it will cost you a little now but save you a lot later
well so far it cost me $700.00
The gasket set is $55.00 The labor is $250.00
I just had the intake manifold gasket replaced on my 96 century yesterday and my bill was $450 but my gasket was only leaking out. If its leaking into your oil it may be more.
It cost us about $700 cnd. That was a shop that charged about $75/hr.
Its probably around $500 mostly because of the amount of labor that it takes to replace it. However if you just order the gasket from the auto parts store and replace it yourself it'll only cost you $20.