My 07 truck shakes while accelerating through 40 mph, 60mph, & 70mph all around 2000 rpm and the Ford dealership is totally baffled at how to fix it. About a month ago I got some HORRIBLE gas and that's when it all started. I've run water remover treatments 5 times (at fill up), tried octane booster (all I run is premium fuel). I've even tried an old school trick of running Dextron III Transmission fluid with a fill up. The only thing the dealership has found is a TSB telling them to run a fuel treatment and some kind of treatment through my air intake. NOTHING has worked. Today I had them replace all of my fuel injectors because a week ago when they plugged into my truck while driving my #8 injector dropped off of the chart at 70mph and then the #4 flux'd at idle. But when they run diagnostics, EVERYTHING checks out like it’s a brand new truck.
The dealership told me to stop running premium fuel and go to mid-grade and only use Chevron…that hasn’t helped either. I bought the truck brand new in 07 and now have 105,000 miles on it.
Does ANYONE have any idea of what is wrong with my beast?

 

How many miles on it? Have the plugs been removed / changed? Maybe a COP?

Just thinking out loud.

 

currently i've got 105,000 miles on it. i got a tune up about 60 days ago...fresh plugs. tomorrow i'm taking it in to have the gas tank removed and flushed with muratic acid because they think there's a possibility that when i got the bad gas, i got a bunch of trash from the gas station's tank.

 

Turned out to have two spark plugs that were arching on the side of the plug and on one of them, the electrode was missing. Ford said it was due to the bad gas and additives/treatments that I kept adding to the gas in my attempt to "fix" the gas. All is well again!!!