Iowa Chapter Director
Join Date: Jul 2002
Location: Ames, Iowa
the fluttering could be an exhaust leak, but its hard to say. If you think its a valve (which I doubt but who knows) take a screw driver, put the handle to your ear, and the tip of it to the valve cover. Try positioning it over each cylinder on both valve covers. It acts like a stethescope and you can pin point the noise.
when the motor is in drive it idles at a lower rpm than it does in park, and then with the brake applied it sucks some air from the motor for the braking power, so there's a lot of strain on the motor at that time, and the rpm's drop even more. So I might assume that the oil pump is worn out a bit and needs replacing if its not producing the kind of PSI it should be. By the way, the oil pressure gauge is a dummy, it only tells you wether theres pressure or not, so if its up, there's pressure, if its down, there's none. You might consider getting a real oil pressure gauge to see what psi its putting out.
1988 Notch Mustang: - 438W, direct port n2o, t56
2003 SVT Focus: - SCT X3 tuner