1995 Isuzu Rodeo Repair Question
Idles to fast
First check for a vacuum leak from one of the hoses and/or intake manifold (gasket). Then check for dirty/sticking throttle. These are the easiest things to check so you do those first. Also, the reason the rpms fall when you engage the clutch: you're putting a load on the engine. It's design to do that.
But you're definitely idling too high. If no vacuum leak, scan computer.
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I agree, the above mentioned is most likely the problem, you may also want to clean/check/change the Idle air control valve(IAC)
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