Thank you for your answers to rlith, BlazerLT, Cherid and Minkles. Work carried out: The mechanic retired the top vortec name plate, but later he also preferred to move away the entire cover of the “dynamic camera” to observe the Nut Kit and the CPI. The interior of the cover of the camera where is the valve butterfly of entrance of air and the whole internal surface of the camera where is the Nut Kit and the CPI presents great quantity of black deposits stuck to the metal and the whole surface of the Nut Kit and of the entrance hoses and exit of fuel. I will take a picture to send it. The six circular conduits that go to the combustion cameras also present the black deposits and additionally there is a layer of oil on the whole surface (the vehicle has been consuming oil in remarkable quantity and does it leave blue-white smoke when it start up in the morning). Is it possible that additionally there is a problem of guides of valves?. Or of rings?. With which product should be cleaned the black deposits?, The mechanic has proven to clean the interior of the cover with the product of 3M “Throttle plate & Carb Cleaner” with good result. Is this product correct for it? How to avoid that the dirt passes to the combustion cameras? Can it retire completely the Nut Kit to clean it? Should the gasket be changed when reinstalling the pieces? Can a seal be used on the gasket? How many injectors does have this motor? How are the injectors regulated so that it consummates less combustible?. Excuse me for so many questions but I desire to conserve this excellent vehicle. Thanks to all.