Here''s the problem...I have a 1993 isuzu rodeo 3.2 l v6 auto 4wd. I can start it up in the morning and it will start fine it will run about 5 minutes then it will stall. I can immediately start it up again and drive it for 100 miles if I want, but the minute I turn the motor off it will not start again for 3-4 hours. I have an oxygen sensor light showing on the dash....Could that be the problem? Or should I ckeck something else first???