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My 2008 Ford Ranger accelerates slowly with the pedal to the floor. It has little power uphill where it threatens to die, and stutters and shudders at cruise?
This sounds very much like a fuelling problem. Since a diesel engine has no ignition system (beyond its own compression) any fall off in performance can often be traced back to the fuel system.
The best bet is to take the vehicle to a diesel specialist that knows this make and model and will have either seen this exact set of symptoms before or will be able to make a logical diagnosis rather than just changing random parts that may or may not be the cause of the problem. Things that are likely causes, however, are the fuel filtering system, fuel pump and injectors. But don’t rule out something simple like a bad batch of fuel that is playing havoc with the entire system.
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