Hello, I have been having issues over the past week with the 1987 Suntracker 24' Pontoon boat. It has a 90hp Johnson 2 Stroke engine around the same age. If I run the choke off the bat and put the accelerator up it runs fine but as soon as I slowly bring it down to the lower rpm or idle it just slowly trickles off. Originally this started when I put 87 Ethanol gas in not knowing from the previous owner it was to be 93 premium with no ethanol and 2 stroke oil to go along with it. It was shutting off when I had that gas in there. I have however been able to slam the accelerator down then pull the gas up and it run's fine till I bring it close to idle. So far I have completely changed out the battery and re did the grounds. I inspected the wiring to make sure everything is corrected properly. Today I changed the spark plugs as a last resort, along with burning out the gas and now running it on what it is supposed to be. Any help is much appreciated, as prior to putting this gas through the boat had run fine, so it is worrying but I am hoping there is a simple fix.
