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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It sounds to me like there is still a pretty good vacuum leak somewhere, and you should also check for any dis-connected or missing vacuum lines on the intake manifold, at the carburetor, and the large vacuum hose to the brake booster unit and the vacuum valve at the brake booster unit for any vacuum leaks or broken vacuum lines/hoses, and they can be hard to find because cracks in the vacuum hoses like to hide on the under-side of the vacuum lines/hoses especially the hard plastic ones. Also the carburetor could be loose or the carburetor base gasket could be damaged, the EGR valve gasket could be damaged, or the intake manifold gasket could be damaged, and these are all the most likely places to suspect a major vacuum leak.

Posted on Jun 02, 2010

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