i was driving in my 91 formula the other night and my check engine light came on after like 5 minutes of driving on the express way..when i got where i was going i turned the car off and let it sit..drove home and on the way it came back on after about 5 minutes again and now its not coming back on at all...could this be a sensor shorting out may throwing a code every once in a while when it has a short?

First try to find someone who can read the stored code for you. I know Advance Auto and Auto Zone both used to be able to read OBD I codes so you can try them. But if I'd have to take a guess from what you said it is doing, I'd have to say that your O2 sensor is going bad. The SES light coming on and off like you described is one of the first things that happens when an O2 sensor start reading wrong.

o2 sensor? i do have motor oil leaking from my intake down the bellsousing of the tranny onto the exhaust and then to the cats where it then smokes like ##### and looks like its on fire hahah...pretty emarrasing id have to say.. maybe the oil is interferring with the reading of the sensor?

Not only is the oil interfering with the O2 reading that same oil has probably fouled the O2 sensor up completely by now since any type of fluid that can get inside of the O2 itself will totally trash it so that it can't read at all.

So fix the oil leak, then replace the O2 sensor, get any codes cleared and go from there cause if you replace the O2 with the leak still there it won't do any good since the new one will get trashed as well.

well i fixed the oil leak this week and i now have oil pressure...ill look for the check engine light coming back on but it only did it those 2 times..