When I push the throttle down to fast on the Evinrude, It dies?

Its a 1980 70HP Evinrude, Compression is Good, Carbs were clean last season but I did not run all the gas out of the tank before winter and it sat in there. Whenever I get on the water everything starts fine and idles fine but it takes forever for it to go fast. I have to slowly push the throttle forward and let it sit at a certain position for a good 2 minutes or more than when I hear the engine roar a little bit, I know that you can push the throttle in full so you can go fast. Otherwise If i do not do this, and just push the throttle up fast it dies every single time. I checked the gas line going to the motor and it was clean, nothing seems to be clogged up.