Re: Begging for help!!! '11 Jeep GC experiencing shudder/choking. Is there a fix??
I recently went through this experience as well. Went to the dealer and they performed a software update (service writer could not tell me what TSB they actually performed... bastard!).
The "software update" did help, but did not resolve 100%. I would say it is 60% better than what it was prior to the update.
I have a 2011 (build date 10/10) 5.7L and bought it with 57k (CPO). Spark plugs are suppose to be changed every 30k miles for the HEMI, and figuring that it was close to the 60k mark, I went ahead and ordered the 16 plugs. After replacing the spark plugs, the shudder improved another 20%.
My last attempt is to use 93 octane gas to see if it'll make the shudder imperceptible. Haven't driven around enough yet to see if the higher octane makes a difference, but will report back.
My suggestion is to see if the spark plugs are worn, perhaps the spark plugs weren't replaced at 30k? Or perhaps there is premature wearing before the 60k mark. Maybe remove a couple spark plugs first and investigate if they look worn. When I took my spark plugs out, there was a 0.055 gap when new they are suppose to be gapped at 0.043. FYI: I bought the OEM Mopar spark plugs from amazon for $60 (qty 16).
Hope this information helps!