In the last couple of months we have had two S110P's that when started up with a cold motor they had a rough idle and a little black smoke. On the first trk. I checked all the basic things first and nothing helped(good fuel, fuel filter, clean contacts inside dist. cap,sea foam, air filter, cleaned plugs, ect. Truck ran fine once it got over 1200rpm + -. but still had that little rough idle. This was about to drive me nuts after two days of jacking with it. Then finally I found the problem and it will be the next thing I check on the next one. In the picture you will see the two clean black vacuum lines that were replaced. The old ones had cracks in them creating a vacuum leak. WOW, what a simple fix. Then about two months later another s110p with the same idle thing and thats the first thing I checked. Sure enough the one with the green vacuum reducer( or what ever its called) line was cracked creating a vacuum leak. I wish I could get over for thinking the worst and think about the simple things first. In the long run I guess it builds character.