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Need help! Misfire in multiple cylinders

Old 10-16-2014, 07:49 PM
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Default Need help! Misfire in multiple cylinders

My 2002 f150 5.4. It started at just cylinder 6. I replaced coil and plug as well as cleaned the injector. It fixed it for about 50 miles and then started misfiring again. Now it's showing a misfire on #6, misfire in multiple cylinders and misfire on start up
Old 11-15-2014, 10:14 AM
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My 03 did the same thing- check your vacuum lines. The elbow on the back of the intake is a prime suspect.


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