For a while now I have been having some sporadic throttle responsiveness/power/acceleration issues. One day the truck will run as expected with all the power you'd ever want, and the next it feels sluggish and doesn't respond the way you would expect when you try to accelerate. I should specify that this is normally only for light to moderate acceleration.... say going from 35mph-55mph without "punching it". When i really hammer down on it i get the response i expect, but it's that moderate acceleration where you still expect your engine to respond with a bit of attitude that seems to be lacking. I'm looking for suggestions that make sense about what could be causing this. I recently took the TB off and gave it a thorough cleaning but didn't make a noticeable difference. I have done the "at home" fuel treatments including running sea foam through the system. The transmission filters were replaced and fluid changed about 18 months ago, so I don't think it's a shifting problem... but maybe I can't rule that out just yet. It isn't tripping the CEL and hasn't spit any codes. The dealership just had it and said there is nothing obvious from an electrical side other than my tachometer cluster is going bad, which I already knew because my RPM's rarely read accurately. I've come to the conclusion that it's one of two things, plugs or an electrical problem that hasn't been detectable by myself of the dealer. I had plugs put in last fall and the place installed platinums, which I have recently discovered is not recommended in the Hemi's. I'm considering changing them out soon, but am curious to know if plugs would cause only intermittent problems. Like i said there are times when it runs exactly as expected and there is no sign of a power/responsiveness problem. Could plugs be a culprit for this or if it was plugs would it be constant problems? If it sounds more electrical do you have any best guess as to what the problem could be? As mentioned there are no codes and nothing the dealer could pinpoint other than the tach cluster, and I don't see how that could be causing this.

Pretty much open to guesses at this point because mechanics haven't been able to give me a reason.

 

Plugs wouldn't give intermittent results.

 

Any guesses as to what would give intermittent results?

 

Coil packs or spark plus wires can give intermittent results depending on the weather. A cracked coil can run fine in warm weather and crappy in rainy weather.
A cracked coil could also perform bad in cold-warm temps and fine at operating temps.
A 'going bad' coil pack can give a weak spark output so under hard throttle, you get some stumbling in that cylinder.


You can do a test by reading the OHMs with a multimeter. This ivolved removing them form the truck. They should all be within a few Ohms of another. If not, you have an issue.

 

Interestingly enough it's normally under light/moderate throttle when it's most noticeable. Hard throttle is when the truck performs more as expected. And I've noticed that cool temps seem to be the best. First thing in the morning after a cold start and running in cool air tends to be the best.

Wouldn't a bad coil pack throw a CEL?

 

If it causes a misfire sure.... but you don't seem to have any DTCs available to share with us, so you're going to have to get yourself out there under the hood and figure it out.

There have been a few good suggestions for you to do, so get to it and let us know how you make out.

 

There has been one suggestion, not a few, and I plan on giving the OHM's testing a shot this weekend. And the reason for the follow up question was because the initial advice indicated that the problem would show up more under heavy throttle, which has been the exact opposite of what I have experienced so I was thinking it probably isn't the problem. Regardless, I'll do the testing as well as switching the plugs back to copper and see how it shakes out. I wish it would throw a stupid code so the problem would be more obvious, but unfortunately that hasn't happened... yet.

Thanks for the help. The suggestions are appreciated.

 

You have two threads discussing the same issue. There have been multiple suggestions.

Good luck.

 

........

 

let me clarify.. you interjected into another thread and people responded to you. At which time you said you were going to start this thread, even though there are a million threads discussing this issue.