Re: Terrible milage
holley carbs are great, but they are very sensitive to changes in barometric pressure and temperature. to keep your truck running properly, you should check your float level and idle mixture screws on a regular basis. now that you have the truck running better, i would suggest putting a new set of spark plugs in and running the engine for a week or so and getting a plug reading. you want the porcelin on the plug to be light brown or gray. if it is darker or black, drop the jet size by 2, clean the plugs and take another reading. i think your needle and seat is fine, if it were bad you would not be able to adjust your float level, fuel would be running out of the sight hole at a rapid rate.
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