I have asked this question before and the answer that I got was a vacuum leak. My car has a high idle all the time like 2000+ rpm all the time and its pretty much steady. Just wondering where to start to find the vacuum leak if that is what is doing it? I looked at the linkage it all seems to be free and not binding.
Any thoughts on where I should start to troubleshoot?
Check all the hoses & lines attached to the intake manifold as far as they go for cracks & rusted holes etc. Some people use an unlit propane or acetylene torch to supply gas along the hoses & lines. If the rpm increases, there's a leak there.
Update!! I took the hose off the brake master and as I was taking it off you can hair air coming out or going in, I am thinking in...hence vacuum hose....lol
Since I done that the RPM's is down to around 1200 to 1500 down from 2000+, all the linkage is free. I took the propane and went over everything under the hood and no change in the RPM's.
Pretty sure it was, I was out by the door with the rain and wind. When I took my finger off it increased and when I put it back it decreased. It still never went down below 1200 to 1500 RPM's. I am going to double check again the weekend.
Maybe a stupid question does the engine have to be warm or does it make a difference?
Cold RPM should be about 1200. Warm RPM should be about 900.
If you disconnected the hose at the booster, you may still have a leaky hose. Disconnect it at the other end and plug the hole on the engine to verify that the hose is OK.
Update. I went over all hoses again with propane and no change to the RPM's, RPM's steady around 1200. Idling pretty smooth and too me it didn't seem like it wasn't idling high. I remembered that I had one of those EQUUS vacuum tester and RPM gauge/voltmeter. I hooked up the vacuum tester and the vacuum is solid on the normal and the RPM's that is showing on the gauge is around 950. So that leads me to believe that my tach is not accurate.
So that leads me to believe that my tach is not accurate.
That's more than possible.
The '88 Formula I acquired this summer didn't have an instrument pod. I've tried three different instument clusters in it and none of the tachs in them read correctly.