I have a 88 MMM with the g63b. Bone stock. From time to time the truck will just crank and not fire up. It will roll start though. It doesnt do it all the time and there isn't really a pattern. It does kind of smell like fuel when it does this. Any ideas? Is it just flooding out?
Also I cant give the truck more than 30-40% throttle. If i give it any more than that it falls on its face and blows black smoke. Think a diesel "rolling coal" . I have tuned the carb with a dwell meter and it didn't change much. So I had a tech at work tune it (I worked at mitsubishi at the time, he has been there 20+ years) and it ran pretty the same. I cannot find any vacuum leaks, I have cleaned the carb very thoroughly and it runs exactly the same. My next thought was to replace the 02 sensor, but I wanted to get opinions first. I am leaving for boot camp in just a couple weeks and I would like to get these issues sorted out before I leave so the truck doesn't give my dad any issues while I'm away.