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In short the truck probably needs a carb rebuild and check ALL vacumm lines and could be one of several sensors on the carb itself.Typically after 20 plus years the nikki carbs if not maintained (clean) require a good rebuild kit and checking for cracked vac lines and cleaning the sensors helps alot.Tough to narrow it down and as long as the idle has never been adjusted points to various things.Hope this clarifies what to consider.
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A vacuum leak is one possibility.
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how do replace the thermostat on a 1999 mazda b2500 truck?
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