The bus seemed to be a bit sluggish lately. I changed the spark plugs and wires this weekend thinking that the plugs were fouled. The plugs looked good in regards to color and were very clean. It appears that they were not fouled. However, after the change, the bus was markedly more responsive. So it appears that maybe the spark plug wires were worn out. We will watch how long the responsiveness lasts. Unfortunately, one of the new wires was broken out of the package. They are Taylor wires and one of the short wires ends that go into the distributor was broken off. So I had to use one of the old wires until I get another new set.