Mikeyld

Has anybody else encountered a rough idle when warm in drive with foot on brake? Have had it to the dealer twice and they can't find anything wrong. Being an old mechanic it feels like a coil but can't pin it down.

Tikka243

My 12 5.0 does this as well. Gives a shake or a stumble from time to time at red lights, etc. Dealership couldn't find anything wrong then again as soon as I said there were no engine lights on I don't know how hard they looked.

JDXer

My 14 does the same as well, thought I read somewhere about sparkplug gap being wrong/ not consistant.

JLTD

Same here in the 2013. Had it to the dealer, they said they checked for codes and plug gap, all was normal. Also said it's "normal for that engine". Well it certainly didn't happen on my previous 5.0 (stolen) or the rental I had for awhile. :dunno:

Mikeyld

Mine seems to be worse when it's hot and the ac is running. I also thought of the coils or plugs. May have to try a set of aftermarket plugs and see.

Tones

Perhaps also try cleaning the throttle body. Just cleaned mine and it was quite dirty at 27k miles.

digitaltrucker

my 13 has done that!

Johnnyh55

I have a '14 5.0 and it does this as well. Is there a more than likely solution?

Johnny_bravo00

my 15 5.0 does this as well. Dealer reprogrammed PCM, still does it.

violinguy77

Pull your plugs and close the gap down to .040. If you are tuned you can go down to .034. It will only take about an hour to do.