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Old 04-09-2012, 04:07 AM
BurningBlue's Avatar
BurningBlue BurningBlue is offline
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I am getting a very similar problem. A random 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 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.
2003 Ram 1500 4.7L Quadcab
1998 "Nassy Blue" Corvette LS2 6spd - 450 RWHP

Last edited by BurningBlue; 04-09-2012 at 04:31 AM.
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Old 04-09-2012, 01:41 PM
chambers chambers is offline
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Originally Posted by BurningBlue View Post
Any idea what my problem could be? Just ran a whole bottle of Seafoam in the fuel tank, and it didn't help.
It could be your TPS, IAC, or old worn spark plugs. I also recently saw a thread where someone had a similar issue and thought it was their alternator, so you may want to check the alternator and battery.
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Old 06-05-2012, 11:03 PM
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Screwbs Screwbs is offline
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Vehicle: 2002 Dodge Ram 1500 SLT
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Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
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I've read through your post as I was experiencing a rumble at idle as you described. Extremely low idle almost to the point of stalling while at stop signs, changing gears, accelerating at low speeds, etc... It has been happening since I bought the truck 26k ago. Recently everything started to get alot more rough and my check engine light came on. Misfire detected in cylinders 5 and 8.

I attributed this to my old plugs which we recently played with or possible fouled injectors.

After several calls to some of my trusted parts suppliers, I was onto a lead.

I had mentioned the issues that were arising to all 3 suppliers and got the same questions.

What's the mileage?
a) 326,000km

Have you checked your fuel pump/internal filters?
a) no

Sure enough. Dropped the tank, pulled the pump and the intake sock was jammed, the regulator/filter on top barely forced gas through the lines. My part suppliers were correct. My engine was running lean and I could have easily burned up a cylinder or the whole engine.

New plugs for good measure. Good cleaning to the fuel injectors and a brand new fuel pump including intake sock and regulator/internal filter.

Tada! Idles down to 550 in neutral/park/drive when stopped and no stumble. Can not even feel the truck running. No issues with acceleration either.

I notice you said you changed the fuel pump assembly but did you change the entire unit?

Just thought I would share my story in hopes it could help you out.
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