No. If your idle seems too high turn your truck off, and disconnect the battery cables, wait about 10 seconds, then reconnect. This will drain the remaining "Ground" from circulating. I recommend this process because the idle is automatically set.
No.
No
Could be the idle is set too high, maybe the mixture screw passageways are plugged up.
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carb problems, adjust the idle screw and see if that helps
i would change the spark plug wires
IAC (idle air control) valve may be bad. Located on the passenger side of the throttle body.
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it should be threaded into the base of the throttle body.
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