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Old 04-09-2012, 03:36 AM
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Default Idle stumbling issue...help

I am getting a strange problem. My Ram is suffering from random fits of low RPM stumble, that usually only presents itself while stopped or at very slow speeds. I never have any symptoms during normal driving...sometimes it will stall out though at a stop light or bounce from 800-2000 RPM.

It is very random, sometimes doesn't happen at all during an entire driving session. When it does happen, it doesn't matter whether the engine has warmed up or if I just started up the engine, it usually doesn't last very long...maybe 20-30 seconds. The headlights and console lights dim & brighten with the idle bouncing back and forth. Also I get no codes thrown...completely stock engine 66k miles. No leaks

Any idea what my problem could be? Just ran a whole bottle of Seafoam in the fuel tank, and it didn't help.
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Last edited by BurningBlue; 04-09-2012 at 03:39 AM.
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Old 04-09-2012, 02:30 PM
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I just had the same problem start checking your fuel pressure while you drive that's how I found out. everything at idle looks normal but when i hit that gas pedal the stumble begun. Mine was the fuel pump
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Old 04-09-2012, 09:47 PM
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Another thing to look at is your idle air control and throttle position sensors. The rpm fluctuation is pretty common with our trucks. I replaced both at the same time because it's a cheap and easy job so I can't say for sure which fixed the problem. All I know is my truck runs like a champ now.
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Old 04-10-2012, 10:05 AM
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Quote:
Originally Posted by Trock03 View Post
Another thing to look at is your idle air control and throttle position sensors. The rpm fluctuation is pretty common with our trucks. I replaced both at the same time because it's a cheap and easy job so I can't say for sure which fixed the problem. All I know is my truck runs like a champ now.
would it still fluctuate the idle during open loop.....if one of those were going out?
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