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I have been using my vp37 fuel pump tuning box for a few years with success and no check engine lights. This week I turned it up a 1/4 turn with some smoking and somewhat increased acceleration. I have been pulsing the throttle in a attempt to clear the injectors and it seems to have worked. As now when I test floor it it makes double the smoke from the first few days of driving with it turned up. It seems to me the injectors are cleaner / flowing more fuel from me pulsing them while driving with the tuning box turned up.

When I bought mine the seller had all positive feed back with it and everyone agreed , it worked.
Sorry to hear it did not work with your car , very disappointing for you.