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98' DURATEC with the secondary valves. Removed the upper and lower intakes and can easily clean the butterfly's on the lower intake, BUT is there a way that I can clean the actual intake "VALVE" and port? With the lower intake off the intake valves can be seen sitting just inside the port and are accessible. My question is, can I spray carb cleaner into the port and around the valve or will this harm the engine when I start it up? I can't think of any other way to get them clean and they are really carbed up. The main valves and ports are sparkling clean thanks to running injector cleaner every 3,000. Anyone done this before?