nedd some help here guys. I have a 1995 mariah with a 350 fuel injected v8. Heres my problem, arter running it for about 45min I hear a warning beeper from the engine compartment. Then the boat has a iraddic idle and is hard to shift in and out of gears. It will also die when idoling and is hard to start. But when you get it in gear and open it on up it runs fine until you put it back in neutral. Some people have told me it may be a o2 or other type of sensor. Any help will be greatly accepted. 