Question about Ford E-150

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High idle or shut down when at red light

My 87 van will idle real high when at a stop, then as we are going down the road it will buck. then we have days that it works perfect.

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  • Mike Butler
    Mike Butler May 11, 2010

    Engine, & whether carburetor or fuel injected please?

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  • 24 Answers

Check the exhaust compression. Remove the O2 sensors before the cataylic converts and see if it improves. If it does that means your cats are cloged and need to be replaced.

Posted on Feb 21, 2009

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Posted on Jan 02, 2017

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Usually "bucking" is caused by ignition. Timing or faulty spark plug wires. They will ildle fine, but when you start driving , the miss firing starts.
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