Misfire? Running rough around 50 mph and 12 to 1500 rpm? - Chevrolet Forum - Chevy Enthusiasts Forums

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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.

"My 98 Oldsmobile is so Super Sperrrrrrrrm! Suckers to the side I know you hate...my 98!! You gonna get yours! Get with it, the ultimate homeboy car."

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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.
2003 Chevy Suburban 5.3L-Brown
1996 Bronco XLT-Black
1986 Bronco XLT-Black 6-inch Lift 35x12.50x18 BFG MT
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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....
2002 LT Auto Ride Suburban 4X2 (way better than the new one)
That had many extra aftermarket features! (thanks to 1st owner who only put 15,000 on it!) Had extra stuffed seats, factory looking dual exhaust (nice tone to it), very nice wood trim (not fake trim from dealer), extra dark tinted windows (including drivers).

2007 LTZ Suburban 4X4 (put to shame by the 2002) Nothing special, just the regular LTZ package, just missing the 6.0L, other than that opted out.
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