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2002 Ford Ranger Question: what would cause the engine to have a low idle, then surge when driving hwy



kellydan, 2.3L 4 Cylinder, Lancaster, TX, October 27, 2013, 16:27

it idles low when stopped, then when running at a higher speed it seems to surge. at times the brakes are hard to push.

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  • Answer #1

    October 27, 2013, 16:36

    Needs to be checked for correct intake mauifold vacuum. Then for vacuum leak(s)! Probably needs to go to the shop.

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