Is this a Generator or A/C Problem

On Saturday, my wife and I were driving north on I-15 south of Barstow. Exit 165 (Wild Wash Rd) Had an inside dual go down. (no damage to RV) We were going to Las Vegas on business.
We got off the HWY, I Called Coach-Net, another post in it's self, )at 1645hrs.


Being as it was over 100 degrees and we had our Throw Away Dog (we rescued him from the Animal Shelter) I started the Onan Microlite 4000, it seemed to run like it was struggling,
When I first went to start the Generator it did not catch. Pushed the re-start button it started. When it first started, it took a couple of moments for it to come up to speed. The generator seemed to surge a couple of times. It was very hot outside temp. I opened the generator compartment door so it would have better outside air circulation. I ran the generator for about 5min before we turned on the Air Conditioner. I did check the oil before we left the storage yard. We were not low on fuel had over 3/4 of a 55gal. tank. According to the monitor inside the RV it was putting out 118v and fluctuating between 120v held mostly @118v.
I have only run the A/C on the Generator maybe 3 times. There are only 215hrs. on the Generator.
(I opened the side access door to the Generator compartment for better ventilation) then when we started the Air Conditioning (1 unit Coleman Mach 3) it would run for a minute or two and then shut off. (The A/C) That was using the Auto set on thermostat or turning it on manually. The generator was putting out 118v. Rather than burn out the A/C I shut it down, and opened all the windows. Also shut down the generator.

Last year I had some what the same problem took it to an Authorized Onan Service Center
The Onan Authorized dealer that repaired the unit last year, changed the Carburetor & Fuel Filter. Put fresh 30w Oil in it. New Air Filter also.

We get the tire changed drive to the KOA campground in Yermo Barstow/Calico. We got to campground at 2045hrs.(people bad mouth KOA, but you think about it and their prices are about what the going rate is today, and they do not have a Bovine Excrement age limit rule) We called a campground in Las Vegas and were told because our Class-C RV is a 2005 they would allow us it stay there but next year we couldn't use their campground. :h :S

We get set up in our camp site, I check power pedestal (putting out 125v) Plug RV in to AC Power, Air Conditioner runs great, :face palm:

Being as we had no spare and could not find one we turned around and came home. (Also do not trust the slugs that work at the tire shop to put 80psi in the tires, always check them yourself) I asked the clown to put 80psi in all the tires, every tire on the RV was at 65psi. I really should have watched him while he was doing it I really think he was just trying to placate me. :M When I used to drive trucks cross country I used to check air pressure in all of my tires before I would start out, and every three hours I would stop and walk around and check the tires and other things on the rig. I guess I better start doing that again before I even l think about leaving the storage lot.

I think there might be something wrong with the Onan, we had this problem once before and had it fixed last year. I have the GS CSP I think it's time to take the unit in to get it worked on again.
I can say this there was no damage to the RV (maybe a little to my pride) No one was hurt or injuried, we got home safely. We didn't need to go to Las Vegas anyway.