2000 Mistubishi Montero Sport. It's got about 125K miles on it, been taken care of reasonably well. Lately sometimes it will just not rev when I hit the gas... it's like there's no gas getting to the engine. Then it'll suddenly kick in and go...or it'll start to rev slowly but not really go anywhere. It's like the engine isn't getting gas, then sometimes when it does it doesn't shift into gear properly. When it's happening it'll run really rough and sound like it's about to die when it idles, it usually doesn't actually die but it has happened. And it doesn't do this all the time either...it's weird. That's a crappy explanation, but does anyone have any idea what would cause that?