[Smurfy]

I’m needing some advice on a 1989 8v92 in a Newell Bus, I drove it about 700 miles Saturday with no problems at all, the generator(complete separate unit from the bus),  had quit so I was working on it in the driveway, I did nothing with the bus at all other than move it from the storage area to the shop.....all was fine, when I went to put it up last night the bus had very low power and was slow to build rpm....it will build to max, but very slow and it also has always busted off without hesitation, but now it has to crank a few seconds and you have to give it some throttle to get it started, and when it does start it’s putting out a little black smoke, not bad except on initial startup.......so far I’ve changed both fuel filters, drained the separators and pulled the air filter, I’ve been told by locals that it’s the emergency shutoff valve, but I don’t see one...with the ecm, I’m thinking it don’t have one......any help would be greatly appreciated as it’s scheduled to go out again Friday.