I have a question for you mechanics?

-any of you mechanics know weather a vacuum leak can cause the check engine light to come on. i have a 1988 oldsmobile delta 88, 3800 v6 and the check engine light came on the other day when i kicked it down in passing gear to get around a big truck and it,s been on every since.i ran a test on it and it keeps coming up 13 and 14 which is the 02 sensor and the coolant sensor. i unhooked the battery and changed both of them but it still stays on. i checked all the other sensors too. it will start up and sit there and run good but the light stays on. on the road it seems like it has a lean burn. i pulled the plugs and they are all burning good but there is a slight miss to it idling. i can get a computer for it but everyone i talk to say if it was the computer i would have worse problems. it did,nt happen until i kicked it down. would it be possibly be the fuel regulator on the fuel rail? the transmission works good like a new transmission, no smoke coming out the tailpipe, the tailpipe is clean, no gas in the oil and my anti-freeze looks good and it stays full. i,am going to check for any vacuum leaks tomorrow. i appreciate any help you can give me. i worked on several cars but i,am not too good when it comes to these computers. thanks guys !I think you are on the right track-13 years old car has brittle vacuum lines-breaks let in air and makes the computer wonky-to help you find leaks-spray wd40 on the lines-when engine runs/sounds better probably found bad lineon an 88, no. it is an obd1 system that is only looking for opens and shorts in the electrical systems. a vacuum leak is beyond the ability of that computer.
If it,s a slight miss,pull one spark plug wire ate a time & find out witch cylinder it is.Might be plug wire.If it,s 2 cylinders it might be a week coil pack.Clear codes.Miss-fire should show up,or something else.Do you have 2 O2 sensors?up date what u find!
You should prolly jack up the radiator cap and slide a whole new car under it.