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Ford 460 (1997) EFI Sudden change in color of exhaut pipe end from toasty brown to sooty black. SB Traveler 11-10-16  
I have driven our RV (33ft class A) for 4 years + and always noted the exhaust was a toasty brown residue which to me is a sign of a clean burn. It always hummed along at 55/60 until the last trip on a very hot day from Palm Springs to Yuma.

I slowed down for an inspection station and when I accelerated there was a terrible vibration up through the steering column to the point where I thought I had a tire problem or the front end was coming out. I pulled over checked visually and could see no physical issue. I continued driving and slowly took it back to 55 mph and noticed that the vibration was subsiding except on acceleration, once up to speed (on level road) the vibration subsided to the point that I assumed I may have an electrical problem although I could not hear any backfiring.

When I arrived at destination (about 40 miles) I noticed that the exhaust pipe ends are all black with a heavy concentration of carbon. My question is what should I be checking or replacing before starting back on a 1600 mile tour?

Any help in this regard would sure be appreciated.
Re: Ford 460 (1997) EFI Sudden change in color of exhaut pipe end from toasty brown to sooty black. ronald gallant 1-22-17  
Hesitation when accelerating. have done complete tune up new rotor plugs etc new fuel filter
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