I have a 2007 tige rz2 with a 5.7 marine power engine. When I put the throttle down I get a loss of power around 3000 rpms and a backfire noise in the engine. I’ve replaced the throttle potentiometer, throttle body, replaced the paddle wheel to gps, reflashed the ECM. Changed the fuel filter and nothing has helped. No error codes when on the computer. Any suggestions?
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