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I recently had this problem with my 1998 Dodge Ram 2wd w5.2l, It would start right up and after a couple of minutes would idle very rough and then you could hear the idle control motor opening up making a loud wooshing sound, then it would close idle up then back down. This would happen about 3 cycles, before going away in about five minutes from start up. If I would drive before the cycle ended I would experience poor mid range throttle response along with back firing out the intake. I presented this to the dealer who was clue less about this complaint. So being mechanically inclined I borowed a scan tool and found the primary (before the catalist) 02 sensor was reading abnormally, and staying in the rich (.9-1.5v) range. I replaced the sensor and the truck is back to normal

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Q: What might be the problem with a 1998 Dodge Ram 1500 2wd that surges and revs high and low at start up?
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