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1995 Jeep Cherokee chugging - minor backfiring won't excelerate

Purchased  used - told about problem and that the new fuel filter, tank and pump took care of it but it didn't. getting cold up here in NH and it now doesn't happened on early morning commute but during afternoons it does. Can be driving along 40-50 mph and starts lugging / bucking sometimes has a minor backfiring sound. one time it happened for 7 1/2 miles and I couldn't get it to go faster than 30 mph - never shuts down completely. stops behavior when I take foot of gas pedal. Last 3 days during the afternoon commute I turned heater on full blast and it didn't do it at all first two days and only at the end of the hour ride home today.  Multiple trips back to place of purchase with no solution. Nothing showing up on computer. Very curious and frustrated.

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My 1993 cherokee did the same thing. I also had changed the fuel filter and pump and it did no good. ...mine turned out to be the electric fan wasn't coming on (the relay was bad), and it was running too hot.

Posted on Apr 26, 2010

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Sounds like it is running lean because of fuel not getting through or air getting in. Taking foot off pedal means the air fuel ratio changes and the engine can run ok at low revs. Has the hot wire on the fi been checked. The last time this happened to me was in a alfa when the crud in the tank blocked the final fuel filter into the carb. The fuel system has several filters so check them all.

Posted on Sep 23, 2008

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