I have a 1992 nitro 180fs with a 1992 Johnson 150 gt. It always starts when cold using one push of choke. After fast idle seems to come off I try to throttle up to higher speed. It wont go beyond 2000 rpm and wont get on plane. I,ll pull back try again same thing. Blowing unburnt fuel from exhaust.Turn off, Let sit for 20 minutes and then start not using choke just turning key will then have full power to easily get up 50mph. No sirens go off but not certain that system works for sure. Any ideas? Thanks