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Old 09-27-2011, 06:24 PM
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Default Misfire? Running rough around 50 mph and 12 to 1500 rpm?

My 2001, 150000 miles, Sub just started running a bit rough, possibly a misfire, but not sure? Around 45 to 50 mph, 1200 to 1500 rpm, most pronounced going uphill, engine seems to skip, run rough, misfire?, If i downshift it doesn't seem to do it? Normal idle and low speed, smooth running. There isn't any check engine light on. I thought about plugs and new wires, but some of the stuff I have read here doesn't really back that up as a solution. Possibly and O2 sensor although I thought I would get a check engine light for something.

Does anyone have any thoughts or recommendations before spending a $1000 with mechanic checking things of the list. Thanks in advance for any help!!
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Old 09-28-2011, 12:16 PM
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may be a pending code in the computer...scan to see.
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Old 09-28-2011, 08:35 PM
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2001, 150K miles I'd start with a good clean tune up...run a few bottles of injector cleaner, check the fuel pressure... clean up the MAF sensor...
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Old 10-03-2011, 10:58 AM
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Hook up a vacuum gauge and read THIS.
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Old 10-03-2011, 07:07 PM
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More pronounced going up hill... might be the catalyst stopped up.
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Old 04-14-2013, 08:48 AM
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My 2005 z71 does the same thing except hills don't seem to affect it
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Old 04-18-2013, 08:37 PM
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ummm yeah. you got clogged cats if you have zero vacuum....
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