Last season I encountered a problem with my Marine Power 5.7 MPI engine in my 245 Sea Ray. As I opened the throttle the engine bogged down and even back fired with a light load in the boat. I returned to the dock and called my Mechanic. He arrived and removed the cable from the Throttle Body. The trouble seemed to go away. He suggested that I get connector lube from an Auto Store. I did so and lubed both ends of the cable. All went well for several months. Then the problem returned again. I removed the cables and the trouble left. I am at a loos. The throttle indictor or the throttle body could be at fault. By the way I scanned the trouble codes with my lap top and software. NO CODES. Help!