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2003, 235000 miles pulling trailers of various sizes 8' to 48', 5th set of injectors and is smoking again. Little history, I have an auxiliary 90 gallon fuel tank that has an external fuel/water separator filter on it, 95% of the fuel that is put into the factory tank is filtered through that filter. Only Chevy dealers have worked on this truck with oem parts, may be my mistake. Two questions I have are, suggested I mix a pint of atf with a pint of clean diesel, pour into a new fuel filter start her up and put it to the floor, supposed to really clean injectors, looking for answers.
2nd question if I replace the injectors to go with Bosch injectors vs Chevy.

Truck has been smoking about last 10k miles, dealer informs it will not hurt anything
 
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