I've been having intermittant, momentary loss of power to the wheels while driving at freeway speeds in our '95 Park Ave Ultra. I've posted this here before and gotten some tips, which I've followed up on. For example, pursuing the possibility that it was an engine misfiring problem I replaced the plugs and wires, and my mechanic replaced the mass flow sensor based on his (rather expensive) hunch. Unfortunately, the problem is still there.
I now believe it is the torque converter clutch (TCC) and want to confirm the diagnosis. I can cause the problem to occur by accelerating on an up-grade, e.g., the approach to a freeway fly-over interchange. Rather than accelerating smoothly there will be an irregular pulsing or jerking in the acceleration. If I then tap the brake, it stops jerking and accelerates smoothly.
Is this a conclusive diagnosis of TCC failure?
The second question is what is required to fix it. I will of course take it to a transmission shop, but would like to go in with some idea what to expect.
Thanks in advance for your help.
Ed