eX-DZ28

I have a 94 lt1 m6.
When I drive it runs super rich and about half the time if i try and give it gas it will bog down real bad and not accelrate. I tried replacing the spark plugs but there was no change so im figuring 02 sensors next?

The other problem is I tried using a scan tool to find what codes it has been throwing but when i plug the scanner in the check engine light goes off and never displays the codes any ideas? Is my OBD fried?

Any help is appreciated... this cars tireing me out

hitmanws6

iTrader: (20)

mine did that a while back. i did a full tune up (cap,rotor,plugs,wires) and it went away. sounds like your opti is bad. and you are probably using a code clearer. thats why you cant see the codes