[david-b]

Throttle body clean should ideally be used off the car, but it won't do any damage. I y I would recommend pulling it off next time though.

So when you put your hand over the TB, the idle went down to normal? But as soon as you took it off the idle went back up high?

Firstly, check your throttle cable. If you look on the throttle body where the cable connects to, it goes to the intake manifold and has 2 bolts (10mm) holding it on. Between that mount and the throttlebody, there should be some slack. You should be able to press down on it and have the cable move just a little. If there is already tension on it, as if it's holding the flapper open a little, loosen the 2 bolts and move the cable so there is some slack.

If that's fine, check on the throttle body. Some have this and some don't... where the throttle cable connects to the TB, there's a metal 'lip' coming up. When the throttle is closed, it rests on the actual TB (the stopper). Check to see if there's a hex bolt or something in the stopper that's pushed out (would be going toward the drivers side). That stopper, if pushed out too far, will keep the flapper inside the TB open at idle.

Also too now that I think about it, try taking some soapy water in a spray bottle and when the engine is running, spray some around the TB/IM gasket and see if it bubbles. If that gasket is blown or falling apart, it can cause weird idle issues as well.

I know that last one sounds a little weird so if you need pics I'll get some.