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Re: 04 F150 5.4 runs lean at idle
Posted to Technical Discussion Forum on 1/16/2025 1 Reply

Ruptured PCV hose at the valve or at the intake nipple in the back. Ruptured or disconnected breather or IAC inlet hose to intake duct. And it's always worthwhile to check and clean the MAF.

Tom Login to read more.

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