Hi, My husband and I just purchased a 1995 Gulfstream Ultra Supreme. The motor home has 23800 miles and the generator (Generac 4500 watts) has 32 hours on it and it is in prestine condition. When we start up the generator all of the lights work fine, but when we turn on the AC or the microwave it makes the generator surge. We've checked the air filter and sparkplug and they are both good. What could be the problem? It seems like the generator isn't putting enough energy out to run the AC or microwave, but the 4500 watt capacity should be more than enought to run both. THANKS!!