misfire on acceleration.
355

Asked by Dan Jun 07, 2013 at 06:07 PM about the 1990 Ford F-150 XLT Lariat 4WD LB

Question type: Maintenance & Repair

i have a 1990 f150 larait 300 6cyl. i recently did a tune up and got cyl 4 and 2 reversed on the cap.. i feel dumb but now it runs alright at idle. took it for a test drive and i made it about a block and it started to misfire badly and stumble. it would accelerate but not at the rate it should. i think i need to adjust timing? also there is an intake gasket leak and a friend told me that the leak may be causing it because there is too much air getting into the cylinders. any possibility that could cause it? i appreicate any help because this is stumping me. the fuel pump is only a couple years old. i just replaced the fuel filter.

2 Answers
58,575

Tracy answered 11 years ago

While the 300 is a great workhorse - it is prone to warping the exhaust manifold and taking the intake with it. When you do address the concern, don't try to fudge it - you'll only have to do it again. Gaskets help but they aren't the fix. Tennisshoes knows what he's talking about here - vacuum leaks cause all kinds of drivability concerns as well as the carbon tracking issue)

Mark helpful
355

Dan answered 11 years ago

thank you for your answers. i did get it fixed, the timing was badly off. runs much better now.

Mark helpful

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