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

Go Back   Chevrolet Forum - Chevy Enthusiasts Forums > Current Chevy Trucks, SUV's, Crossovers & Vans > Tahoe & Suburban
Log In 

Tahoe & Suburban The power, space, and brutal towing ability make the Tahoe and its longer sibling, the Suburban, arguably the best full size SUV's on the market today.

2013 Chevrolet Suburban
Platform: GMT 400, 800, 900
Sponsored by: Dorman

LinkBack Thread Tools Search this Thread
Old 09-27-2011, 07:24 PM
CF Beginner
Join Date: Aug 2010
Posts: 5
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!!
Reply With Quote
Old 09-28-2011, 01:16 PM
RacerX's Avatar
CF Veteran
Join Date: Aug 2010
Location: New York City USA
Posts: 1,053

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."

Public Enemy "You Gonna Get Yours"
Reply With Quote
Old 09-28-2011, 09:35 PM
in2pro's Avatar
Join Date: Apr 2008
Location: Austin, Texas
Posts: 7,180

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...
Reply With Quote
Old 10-03-2011, 11:58 AM
slw210's Avatar
CF Active Member
Join Date: May 2011
Posts: 189

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
Reply With Quote
Old 10-03-2011, 08:07 PM
CF Junior Member
Join Date: Mar 2011
Posts: 71

More pronounced going up hill... might be the catalyst stopped up.
Reply With Quote
Old 04-14-2013, 09:48 AM
CF Beginner
Join Date: Apr 2013
Posts: 2

My 2005 z71 does the same thing except hills don't seem to affect it
Reply With Quote
Old 04-18-2013, 09:37 PM
CF Senior Member
Join Date: Mar 2013
Posts: 406

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.
Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
2012 vibration from 25+ around 1500 rpm Schooner Tahoe & Suburban 12 06-20-2014 10:37 PM
low power/misfire/high rpm knock/rough idle 85fordyota Express & G-Series Vans 4 06-28-2013 12:26 AM
truck is smoking when accelerating and rpm gauge jumps around. alamozgreat Silverado & Fullsize Pick-ups 1 08-18-2011 12:08 AM
2000 Venture starts vibrating around 50 mph. ventureman Venture 0 07-25-2010 05:21 PM
CAR DIES AT AROUND 30 -40 MPH atlbigboi Caprice 0 11-22-2007 10:16 AM

1500, 2001, 50, engine, hour, mile, misfires, misfiring, missfire, rough, rpm, runs, saturn, suberban, tahoe

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On


All times are GMT -5. The time now is 09:23 PM.