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Like the title says, i have a first gen cummins in a 03 550. Stock other then turning the fuel pump up. Runs fine in the morning but when the outside temp gets up like in the afternoon it runs sluggish..the temp of the truck doesnt change at all but it idles about 150-200rpms less and it wont...

Any body have some files they can share? I have a f550 with an early 12v/5r110 and it has a bump every time the t/c locks up, if it is under acceleration you cant feel it but if it locks up when you are not accelerating, it will bump..not sure what is happening to make it bump, any help/sharing...