I have a 1981 VW Rabbit Pick (1.6) up that needed a battery so I let it sit for a season. When I installed a new battery and cranked it, it smokes really bad, is skipping, and wont idle. The smoke out of the tailpipe is a dusty type black. I thought that it may be an injector so I took them out and noticed that one injector has more of the smutty black than others, so I replaced it. It didn't work. Any help?