Engine idles a t 5000rom

Ill re-check all the pipes etc tomorrow.
It acts like a sticking throttle but the throttle is returning as normal, as is the butterfly.

As DD said. Timing could make the engine and exhaust run hot. This would throw the timing of optimum and slow the engine down.
Are you sure the IACV isn't stuck open?

Nodge68 said:

As DD said. Timing could make the engine and exhaust run hot. This would throw the timing of optimum and slow the engine down.
Are you sure the IACV isn't stuck open?

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100% sure the IACV isnt stuck open

Just went out a re-checked all of the pipes and manifold. Nothing.
Started her up and sat at 2500, then put my foot on the accelerator and pushed up to 4000. foot off and doesnt drop.

Throttle position sensor?

RO51 said:

Throttle position sensor?

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Thats a logical idea but then where is it getting the air from or will the IACV compensate for that?

Just a thought on this.
Check that the cam cover vent pipes are on the correct stubs. There are 2 sizes of breather, one large and one tiny. You can't tell which is which without looking at the inside of the cam cover or probing with a small dowel. If the largest outlet is going to the manifold, this would cause the revving you are getting. The larger output should go to the throttle body. The outlet with the tiny hole must go to the manifold