my 1984 245 dl is having some difficulty idling, it always stays running but it feels like there is a misfire. the engine will sound fine, then die off, then run fine again. the exhaust smells like fuel ( no fuel leaks anywhere) and you can smell it in the passenger compartment at stops. this first happened after replacing the in tank pump, but went away after the first tank of gas was spent. Now it has returned after about 4000 miles. I suspect a vacuum leak. Any ideas? 245,000 and i still get about 30mpg. also the vacuum diagram under the hood is missing, any sites that list it or a place to buy it would be appreciated. thanks