intermittent hesitation and backfire through the intake

1998 JEEP WRANGLER
150,000 MILES • 2.5L • 4 CYL • 4WD • MANUAL
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CRAIG TAYLOR
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I have been having issues with hesitation and backfiring through the intake from 1500 rpm through 2000 rpm's after that it runs fine. I have replaced the ECU, TPS, MAP sensor, intake temperature sensor and both o2 sensors. problem still there. ECU was programmed to my VIN number from flagship 1 out of New York. it is not a constant problem. intermittent.
Mar 19, 2018 at 3:36 PM
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HARRY P
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Have you ever done a tune up on it? If not, then do it. At 150,000, it needs to be done anyways. A bad plug wire or two could cause that intermittent backfiring (I have seen it). Also, is the service engine light on? If so, what are the code numbers?
Mar 20, 2018 at 4:35 AM