That was great arp67. I would check for codes first.
How many hours do you have on your genset? Do you always use a fuel additive like Stabil when RV is in storage? Do you run the genset once a month to exercise it?
Sounds like carb trouble to me. If your adventurous like me I would remove the carb and clean + blow out with a compressor. Better yet ... see if they have a carb rebuld kit on line.
Also check fuel (again)?
Otherwise hopefully you will find the fault code that will lead you on to the correct path.
Might have to take to dealer but the way I see it is .... if its not working well.... try to fix it yourself then bring to dealer. You will be surpised on how much you can fix with the help of the internet and youtube.
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor