I just purchased a 1970 Chrysler Charger W/130hp 2 side draft Strombergs and the 250 outdrive (One owner and only 1000 hrs running time) Yesterday I took it out for the 1st time. I let it warm up until the temp gauge started to rise and then headed out. The boat could not of run any better, but at about 3000 rpm it started to cut out. If you increased the throttle it would take right off again and would cruise great up to about 5000 rpm (As high as I wanted to take it). Any one have an idea what might be causing this?....Thanks