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Check for a vacuum leak or sticking butterfly valve at the throttle body, or possibly a sticking throttle linkage or throttle cable.
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My engine idles too high?
On my Chevy truck it idles high when its low on antifreeze but if its not that more than likely its usually a vacuum line loose or cracked. good luck.
What is injected into high pressure air in a jet plane?
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Why does Chevy Impala idles to high?
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YOU WILL DIE! have you check your IAC ??
How do you fix high idle on an 88 ford f150?
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A compression-ignition engine uses?
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