1991 Nissan Maxima engine runs rough

1991 NISSAN MAXIMA
166,000 MILES • 6 CYL • FWD • AUTOMATIC
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JPM35
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hi guys, My problem is with the engine running rough. This problem recently started. Engine starts ok, but seems to shake slightly in engine bay and exhaust makes a putt-putt-putt sound at tailpipe.Taking off from a stop and the engine seems a little sluggish and choppy sounding. I recently changed all six spark plugs ,but not cap and rotor as they appeared to be ok.
Sep 17, 2009 at 3:14 PM
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DOCFIXIT
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First check pluge see if one got loose and all wires are firmly seated. If all good need a compression test
Sep 17, 2009 at 3:18 PM
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JPM35
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I forgot to mention that this is problem is intermittent. Sometimes after starting the car it is fine , runs smooth. Other times it occurs.
Sep 17, 2009 at 6:49 PM
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DOCFIXIT
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Intermittent is a problem could be several things. Have you tried checking for codes in ECU?
Sep 18, 2009 at 11:39 AM
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JPM35
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Yes, I did check computer.In diagnostic mode 3, I try to see if any codes were stored and I only rec'vd code: 55, which means no codes stored. I also must note that I haven't been driving the car as often I used to in the last year or longer. I'll drive it around to charge -up battery every couple of days. Maybe problem is as simple as a little water in fuel or a build-up of carbon in intake area.
Sep 19, 2009 at 11:19 AM
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DOCFIXIT
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That's good possibility also if battery voltage drops below 11.9V even though alt. good ECU drops out and shuts engine down.
Sep 19, 2009 at 2:39 PM