We've had several Mitsubishi 3.0s in minivans, Dynastys and a New Yorker. If you're doing the timing belt make sure to replace the crank and cam seals too. Just did one one on my father's minivan that had been parked for 6 years because it was hemorrhaging oil. Told him to replace them when he had done the last timing belt, but didn't listen. Chrysler SOHC I believe are free running, but don't think the Stealth is (I think it has DOHC). Father's 278K and he never changed the plugs. I'd change them, but afraid to pull them at this point. Oh, Throttle body gunks up to too.