Question about 1991 Jeep Wrangler

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My 1991 Jeep Wrangler, 4 cylinder backfires when I get up around 40 or 50 MPH. It starts to loose power first then backfires. I re-gaped the plugs to specs., changed the fuel filter, but it still does it. I heard it may be the cat. converter. Please help me ...... Thanks

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Could be the cat.but i would look first at the egr valve and the vacume lines that run to and from it,and vacume test it to see if its working correctly.

Posted on May 29, 2011

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