I'm having a similar issue with my '02 5500 generator. It's a carb-equipped model, so I don't think computers were that involved in running it.
The symptoms are that it lights off and starts to run, but as soon as the regulator starts to move the throttle, it dies. I think I'll be taking the carb off at the end of the season for a good clean-out. We don't use the genny much and I don't think the original owner of our MH did either. After 10 years, it only shows 48 hours on the Hobbs!
I had cardiac surgery in December last year and didn't get to my every 6 weeks generator run schedule until mid-April, by which time it was too late.
Frank Damp -Anacortes, WA,(DW- Eileen)
ex-pat Brits (1968) and now ex-RVers, as of 08 Dec 14.