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International Automotive Technicians Network
Re: '88 F150 4.9L idle is hunting then dieing
Posted to Technical Discussion Forum on 2/19/2004

The 4.9 L is famous for vacuum leaks at the intake and the base of the carburetor / throttle body. the 7.4 L TBIs often leak at the base of the TBI unit - vacuum leaks can cause hunting as it messes with the idle air flow. Login to read more.