Engine idles @ 4,000rpms
1990 Ford Thunderbird

Engine idles @ 4,000rpms

(1990 Ford Thunderbird)
What is the correct idle spped for a 1990 Thunderbied SC? What would cause the engine to idle so fast? How do I fix it?
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Problem is permeant it doesn't matter if you rev it or idle it won't go above 4,000rpm but it won't run any longer...