My weather maker 8000 is driving my crazy. Keep getting code33 I have changed filters cleaned flame sensor took flame roll out switch off connectors and taped together. It will start it's sequence and flames come on and seems like it's going to work but after a little bit it pops again and code 33 comes back on. The inducer comes on like it suppose too. What do I need do I need to buy a new roll out switch my blower motor works fine

You need to monitor voltage across the pressure switch terminals. As soon as the thermostat calls for heat, you should get 24 volts AC across the terminals. When the exhaust blower starts, that 24 volts should go away. If it comes back at any time with the exhaust blower running, you probably have a vent or drainage problem.