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No Cluster Buss Message is codeP1687. May be a cluster problem obviously but appears other things can cause it also. With price of a new or used cluster I would try a few things like pushing diagnostic button on dash, and let it go through the steps, as well as a battery disconnect for a few minutes then reconnect, just to see if you get lucky. if not, make sure you get assurance that whatever the repair shop says is wrong, if it doesn't cure the problem, you don't pay. Sounds like a lot of misdiagnosing being done on this . Sign up on the Dodge Truck forum, for more input. Good Luck
This trouble code is Evap Purge System Performance fault. 1) Check for a loose or missing fuel cap. 2) Check for a damaged or missing fuel cap seal. Recheck for other trouble codes. This fault wont cause the stumblering problem. It turns on the MIL lamp to say there leak in the EVAP system.