Question about 1991 Jeep Cherokee Briarwood

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Missing and loss of power when accelerating

I have changed the distibutor cap and rotor ,plus the plugs and wires. when i accelerate it jumps and bucks and backfires. the thing about it it does not happen all the time it comes and goes.

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Have you had your fuel pressure tested?

Posted on Oct 14, 2008

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What, other than plugs, wires , cap and rotor would be causing loss of power on acceleration, but not all the time,, intermittently.


There is a vacuum advance attached to the distributor. Inside the vacuum advance is a rubber diaphragm that can crack from age an no longer work. Sometimes the vacuum hose that attaches to it may not be getting proper vacuum. This device adjusts your timing when you accelerate. Improper function could cause the problems you describe. Also, a vacuum leak in any of your vacuum system could cause the problem your describing. Too much air intake on take off from a faulty vacuum system could throw off your air fuel mixture on acceleration causing hesitation until the air fuel mixture can catch up which is when the power comes back. Hope this helps.

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Will not accelerate fast without popping and sputtering, but will accelerated slow just fine


you have a miss fire under load the most common cause is a bad spak plug wire, if you give it a good old tune up it should take care of the problem.

spark plugs, spark plug wires, distabutor cap and rotor, air filter, fuel filter, and PCV valve.....good luck

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