Question about 1984 Ford F 150

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1984 F150 won't idle. As soon as I start it, it chugs like it wants to die. After I give it gas for a while, or drive it for a while, it will idle, but idles rough like it could die at any minute. I replaced all the vacuum lines but can still here a leak somewhere. When I spray carb cleaner around the carb it revs up. Even does it when I spray on all of the new lines.

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  • mdbaysinger Jun 04, 2010

    After re-checking and replacing each individual vacuum line, it appears the leak is probably one of the gaskets. I replaced the carb to spacer gasket, but could not figure out where to put the spacer to manifold gasket. The only gasket I found after removing the carburetor was the carb to spacer one.


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Make sure when your spraying that you have a spray tube on it for pinpoint testing. Then disconnect one line at a time and plug both ends until you find the one that changes idle. Spraying without a tube will allow vapors to be picked up by the intake and give you a false reading. Also spray a short burst at each intake to head runner, could be an intake gasket.

Posted on Jun 03, 2010

Testimonial: "Very helpful as far as how to pinpoint the vacuum leak."

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