Twin Volvo pentas. one is running fine. the other will lose rpms when i push it to 4000 rpms. it will pull back to 2000 on its own. i'll pull them both back to idle speed, and i often will hear an audible bang. ii can slowly bring the engines back up to 3500-4000 and will run fine the rest of the day. seems to be a issue only during my first attempt to run at 4000rpms. it does "go away", but happens every time i go out.
i've tried changing gas filter, new full tank of gas, added some stp gas treatment. any help would be appreciated.
i've tried changing gas filter, new full tank of gas, added some stp gas treatment. any help would be appreciated.