Chrysler Repair: 2500 rpm fast idle 96 LHS, vacuum leak, vacuum lines

Question
I've just purchased a 96 LHS, ID plate 5/96. I,ve had the car on one of those little handheld diagnostic computer, it said TPS high and low voltage problems. Replaced TPS but 96 would not fit, ran oem # comes back as 97 TPS. So put on new TPS, car still idling at 2500 rpms(45 mph without brakes in gear)also reset computer. checked with starting fluid for leaks in vacuum lines(couldn't really tell w/engine noise)have checked on dash error light, just 12 55. So now I'm stumped can you tell me what else might be the problem. thank you

Answer
Hello Troy,
Sorry for the the first reply which I think was a blank.
I agree with your idea of looking for a vacuum leak, because with the O2 sensor feedback loop that is what happens when you have such a leak. The starter fluid approach works on cars without such a loop because they are usually struggling rather than racing when they have a vacuum leak. But I think you will find the leak if you go over the vacuum lines one at a time until you find it visually. Use the underhood sticker as a road map to trace them down.
If that isn't helpful, then you could try verifying the actual voltage supply to the tps and the signal that is sends back (let me know and I'll give you the instructions for that) to verify the code you got from the diagnostic computer. That code can also signify a discrepency between the tps reading and the MAP sensor (for the displayed rpm) which is of course what you would expect from a vacuum leak. So that too is why I think vacuum leak is the answer.
Let me know which way things go.
Roland