My 95 Evinrude 28 HP has been having a problem recently with stalling out when accerlating. It starts up great, trolls great but when I accelerate after about 30 seconds you motor starts to hesitate a little and then will stall very abruptly. It starts right back up with no hesitation what so ever and will continue to run fine at trolling speeds. Any suggestions anyone might have would be greatly appreciated. Thanks