Question about 1991 Ford F150

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I have a 1991 ford f150 6cyl. when I give it a light gas its runs ok, but if I give it a hard gas it seem to bogg down and shake, sputter. why is it doing this? I did change the fuel filter and still doing the same..

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Ahhh. you have one of the first verisions of fuel injection... check all your vacuum lines, had a 89 ford f-150 I-6 with a similar problem years back. did everything from change vieciel speed sensor to the oxygen sensor... it was a tiny leak in vacuum line... Good luck!!

Posted on Feb 24, 2012

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Posted on Jan 02, 2017

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