Ok guys got a good one for you. 1994 ford f250 4x4 Truck runs and shifts fine in the city but noticed that on a highway trip the truck will be doing fine then the engine light will turn on and I can notice that the trans seems to hold back wich I start to lose acceleration truck holds back doesnt die when that light turns on trans makes a sound like a fan has turned on I dont have cooling fans. I can stop turn engine off restart and engine light wont come on again pulled codes no stored codes I know that all these symptoms are linked somehow trucks engine runs really good seems like it holds back in the trans any suggestions please help.