Good advice from C&A. You can disconnect the O2 and it won't stop the engine. You need to get your car to a repair shop, unless you want to replace unnecessary parts. Leave it for the pros, it will be cheaper.
Sounds like you are looking in the wrong area's to fix? Check to see if you are getting spark. If its ok, then check the fuel. When has the last time you changed to timing belt? Is the motor spinning faster than normal? if it is, it probably the timing belt?