Question about Ford F-250

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I just put on a new rebuilt carburator on my 460 v8 1987 xlt 250 ford truck 4 WH. drive. its a motorcraft stock holley. I cant seem to find a way to ajust it. Wont run smooth or idle? It was set up for FL. AND I LIVE IN mT.SO WHAT AND HOW DO I AJUST/ thanksyou steve

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If you live in high country your carb is jetted to rich for the thin air. You will probably have to experiment with the jetting if you can't use the ones out of the original carb. The Idle Mixture screws are located on the side of the valve body just behind the float bowl unless you have a pollution controlled carb and they are sealed behind a soft lead plug which can be drilled out to access mixture screws. When adjusting idle mixture screws remember--- A little goes a long way

Posted on Apr 03, 2011

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You have two setting screws on front of carb, You start off by adjusting all the way to the left, Then back off 3/4 turn to both setting screws, Then you have to set your air fuel mixture by just slowly turn your setting clock wise do so until vibration go away. Sorry there is no easy way to explain, Good luck to you,

Posted on Apr 03, 2011

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