Question about 1985 Ford F150

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1985 f150 rough idle

I have a 1985 f150 that has a really rough idle it was taken into the shop and it has an exhaust manifold leak but I also think theres something els making it idle really rough what els should I check?

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An exhaust manifold leak would not case it to run rough. Check vacuum lines that go to the in take manifold. If you have a line that is open it will get too much air at idle and cause a misfire intermittently. You also need to check plug wires. How long have the plugs been in the heads. Check the rotor and cap also.

Posted on Feb 18, 2009

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