97 blazer is missing from take off at 1000rpm to 2000 then clears out code reader says o2 sencor and multable engine missfire

For the misfires, start by pulling your plugs. They either need to be cleaned or replaced if questionable. Then, you may have a bad coil or coil pack. You can test them with a multi-tester-you'll want resistance values that are specific for your vehicle. Alternatively, you can switch the coil packs around (if you know you have a good one from knowing which cylinders are misfiring and which are firing o.k.) If your misfires change cylinder numbers from swapping, you know you had a bad coil. Other possibilities for misfire could be the electronic ignition module or the pick-up coil inside the distributor(if you even have a distrib.)
FYI: code for o2 sensor means that circuit has a malfunction, may be the sensor itself, or a wiring problem. Good luck.