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Re: 2001 Ford 5.4L Supercharged F150 P0171 Only
Posted to Technical Discussion Forum on 8/30/2007 2 Replies

Just put a piece of cardboard over the MAF inlet & see if it'll stay running @ idle. If it does, you DO have a vacuum leak.

The starting fluid vaporizes quickly and covers a wide area. If you do have a leak, it'll get sucked in even though you may not have s... Login to read more.

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