Greetings...Im new here and new to boating. I bought a used 14 ft aluminum Starcraft that was converted to a center console. It has a 1985 evinrude 30 hp. The throttle/ shift cables need to be replaced. My problem is the warm-up lever pops up when I throttle down causing an uncontrolled reving of rpm's also the engine can start in gear when it is not suppose to be able to. Is it possible I need a new control box or are these problems brought about by worn cables? Any info would be greatly appreciated. Thanks.