got a 1987 320i, been playing up wont idle properly, an extemely rough idle . drove it the other day couldnt apply throttle would stutter then accelerate, last time it was started it idled as rough as it ever has, blowing way too much smoke then just died.. checked the intake maifold, found a fair bit of fuely oil in there, not sure if thats good or not? car wont start at all now, getting a pain in the butt, any ideas