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I’m not sure what’s going on with my pickup.

  

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Alright, My 2006 ram 1500 with the 5.7 has something going on and I have no idea. During idling, it jitters more than is normal and it never used to be that much. It’s not terrible but it’s noticeable. When cruising around town and I stop at a red light, it often dips in rpms (around 500 and it used to be 650 700). If I just tap the throttle, the rpms raise to where they should be and stays there until it decides to do it again. This next issue is more annoying, while driving at lower speeds there aren’t any noticeable issues but once you get up to 45-50. It feels almost like it looses power. When I get up to speed it shifts into gear like it should but if I try to accelerate from that point the rpms drop to 1500 from 2000. That’s when I start to try and accelerate. Unless I goose it, it continues to try and accelerate at those rpms all the while shaking very unnormally. It acts like it shift up instead of down but I don’t feel it shift, it just drops rpms until I put the petal down at least 3/4 to the floor. I have replaced the throttle body and the MDs solenoids that control the cylinder deactivation. It started doing this a few months ago. Although the rough idle has only been around since I replaced the MDs solenoids, I have explained all of this in a previous post of mine. I just don’t understand what’s going on. There aren’t any bad noises aside from a rattling pulley, but that’s been around a lot longer than this. Any ideas would be greatly appreciated as I do not want to bring it to the dealer when the truck still works fine the truck does have 170k miles but is extremely clean. Transmission shift really smooth and there is no engine code.


2 Answers
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For a 16 year old 5.7 Hemi, your hydraulic roller lifters are probably worn out.  Pull off a valve cover, have someone turn the engine over and watch the rocker arms.  They should all move the same.  If not, you need new lifters and a new cam.  Pretty common on these.


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Well there's so many things that can make those jitter from bad wiring to the fuel injectors bad sensors bad power control module vacuum leaks blowing head gaskets and on and on. I would start with a guy like me hooking up his fancy scan till taking it for a road test we get so much data from those machines it doesn't matter if there's trouble codes on the engine or not that data tells us what's wrong with the car and we go from there. Otherwise basically you just pissing in the wind guessing


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