B+ motorhomes

I missed some of the comments over the past month. On the rattle, I had noticed a rattle that I figured was the steps over two years ago. I am now deaf to it, but it is still there. I had a really unusual malfunction over last weekend. When I started out of my driveway the service eng light and reduced power light came on simultaneously, and I could only maintain about 25 mph! I looked at the owners manual and learned for the first time that the 8.1 eng has the "limp home" feature where only 4 alternately firing cylinders will fire in order to keep moving when the radiator overheats. Excellent plan, but my radiator was fine. I stopped and tried to start the coach generator (I was getting ready to see a client), and it wouldn't start. I started the eng to add amperage and the generator started. I had to assume that the loose coach battery connection (that I fighred caused the generator problem and fixed) was spiking voltage in the computer and that set off the "fail safe" operation? Has anyone had a similar situation? I don't know if the newer chevy chassis has that feature (6L eng).