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I have an 03' chevy silverado 1500 with only 95,000 miles. It's having a rough idle. It lopes at idle but as soon. As you give it gas it idles fine for a few seconds and then goes back to loping. It runs completely fine while driving down the road. The codes are saying bank 1&2 are running lean and misfires. We can't seem to think of the problem of what is going on. Any ideas?

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Clean your throttle body and map/maf sensor. If that doesn't work you may have a bad iac sensor (idle air control sensor)

Posted on Aug 31, 2017

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Posted on Jan 02, 2017

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SOURCE: 2001 Forester, Rough idle and engine loping driving at low rpm

I had a similar problem on my 2002 Impreza RS 2.5 (same engine and engine control system). In my case it was the O2 sensor on the intake manifold. This happened at 34,xxx mi. so it was covered by the warranty. Replacing the part is very easy. (two bolts and a wiring harness). Obviously I would start simple and cheap and work your way to expensive and difficult.
From my understanding its all caused from the engine missfiring. If its been a while or never, I'd change the spark plugs first. (stick with the Subaru Parts plugs, I went after market and the dealer claimed the plugs were not the correct "temperature" and had to pay for the new plugs and install although they did it without my permition. Thats a whole nother story).
Could also be the manifold pressure sensor.
Either 02 or manifold pressure sensor may cause intermitent check engine light.
Where I live Brookline,MA , Autozone will run a free diagnostic on your car by hooking up to your ECU and will give you the trouble codes and possible remidies. Of course there are no guarentee's but it will point you in the right direction.
Good Luck

Posted on Jun 18, 2009

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1 Answer

2001 Chevy Silverado 1500 4.3L V6 was running fine and then the O2 Sensors went out. I have since replaced them but it with start then idle really rough then die if you let off the gas


Robert, have vehicle scanned for diagnostic codes. Check for vacuum leaks and if you have not done recently give vehicle a complete tune up cap,rottor,wires,plugs,filter's,etc, including injector/throttle body cleaning. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

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2003chevy pu dies at stop lights, low idle whats wrong?


yea id definately try cleaning ur throttle body 1st. My 03 1500hd had the exact same bad idle after my battery went bad it would die at lights unless i kept foot on gas i cleaned throttle body runs perfect now took 30min cost 8$ for cleaner at autozone and theres how to videos on you tube

Aug 13, 2011 | 2003 Chevrolet Silverado 1500

1 Answer

Rough idling/loping at idle it otherwise runs fine off idle.


1. Vacuum leakage Check throttle body and intake manifold for tightness. check all vacuum hoses.
2. Faulty fuel or pump or electrical.
3. Plugged PVC valve.
4. Air filter clogged
5. Leaking head gasket.
6. Camshaft lobs worn.
All of these porblems can cause lopes or erratic idle.

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2010 silverado 4.8 rough idle at initial start. Will stall if put into gear right away. Only started happening this winter. Only 5300 miles. Truck has k


WELL YOU HAVE NEW VECHICLE UNDER WARRANTY.I WOULD SAY BAD GAS WILL CAUSE YOUR PROBLEM.BEST TO LET DEALERSHIP CHECK IT OUT.A FAULTY EGR OR IDLE AIR CONTROL VALVE WILL CAUSE ROUGH IDLING AND STALLING.BUT THOSE ARE NEW PARTS THAT STILL COULD BE DEFECTIVE.

Mar 29, 2011 | 2010 Chevrolet Silverado 1500

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I have 2003 chevy silverado that ideles rough i


there is a lot of reasons to make it idles rough .
and you have to diagnose by it by diagnostic tool (scanner)

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Very high idle at start, slowly idles down after hot. Replaced ICV, sometimes lopes, can shut down, restart, idles right.


change fuel filter. add can of SEAFOAM(parts store) to 1/2 tank of PREMIUM gas. let car idle 3-5 minutes. drive hard at least 10 miles.<p>
you have what I call Ethanol Gas Syndrome. the ethanol gets in your system adds water and turns fuel to brown goop, it also carbonizes valves,injectors, and emission parts.<p>
you might want to change f filter after 500 miles(again). add SF every 3-5000 miles, and this will clean the carbon; fix the gas and fuel system, and dry the water. good luck.

Aug 31, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Loping engine


try cleaning your idle control valve, make sure you dont have any codes in your computer, if you do address those codesl

Feb 01, 2009 | 2001 Chevrolet Silverado

1 Answer

Rough idling and lopes


oxgen sensor needs replacement this controls the air flow

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