This is my first posting and first boat, so any help would be greatly appreciated. I have a 1985 OMC stern drive with the 2.5L motor. My problem is the motor will start and run for about a minute or two than die. It will start back up right away, but after doing this 2 to 3 times than it will quit abruptly like it is seized up. It will turn over right after the abrupt stop. We did this for about 5 or 6 times to make sure we had fuel and spark and on the last time it quit there was a slight grinding noise coming from the back of the motor or the intermediate housing. Any ideas!!!! Thanks for any help.