I've noticed lately that my RPMs seem to do a funny thing, and it seems like its transmission related. If I am crusing at say 40 MPH in a straight line and I have my foot on the gas to maintain speed the RPM, in 4th gear, are about 1,700. If I let off the gas the RPMs drop slowly for a second, as would be expected, but then quickly drop to 1,000, almost if you had thrown the clutch in (its an automatic tho) and then after a few seconds it will go back to where it was when it was dropping, or if I gas it again it immediately jumps back to it. Is this normal or is there a problem? I haven't noticed it doing it before, so I'm not sure. It never goes out of gear and never free revs while in drive, but it still seems as if it engages a clutch.
Also, unrelated, I am trying to change my air filter but the stud that the lower left screw on the air filter box spins with the nut and I can't get it off, is there anyway to remove it without taking it to a mechanic or getting destructive?
Can't help on the RPM issue but it doesn't sound good to me, that's for sure...
As for the air cleaner stud, are you taking about one of the 4 10mm nuts tht hold the metal top to the plastic bottom? If so, just remove the whole air cleaner assembly from the engine. There are only 3 mounting places -- the two isolators on the intake manifold (10 mm nuts) and the one on the side of the housing above the throttle body (again, a 10 mm nut). Of course there's teh air inlet duct and the breather hose to the rocker cover to deal with. Anyway, with the whole air filter housing removed from the engine you'll see that the studs have a square bottom that is visible (and accessible) from the underside of the housing.
During reassembly just make sure that the rubber seal is properly joining the throttle body and the air filter housing.
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