Here are the engine codes (note, they are P-ZERO-104, not P-OH-104)

P0104 - MAF SENSOR THROTTLE ANGLE AND SPEED
P0134 - O2 SENSOR 1/1 CIRCUIT OPEN
P0154 - O2 SENSOR 2/1 CIRCUIT OPEN
P0300 - MULTIPLE CYLINDER MISFIRE
P0302 - CYLINDER #2 MISFIRE
P0304 - CYLINDER #4 MISFIRE

This might sound like a dumb question but did you run it out of gas? We have a pressurized fuel system on these cars sorta like old diesel tractors that you'd need to prime them if they ran out of fuel. If you did, cylinders 2 and 4 are closest to the test port and farthest from where the fuel enters the fuel rail. You could have had an air pocket and not a good solid stream of fuel going through those injectors hence the 2, 4 and multiple cylinder misfire codes. The O2 codes could be from it cranking and not seeing a steady pulse as it would when the engine is running normally and the maf code could be a result of the this two as it is comparing what it sees to the O2 sensors. Just a thought. If you didn't run it out of gas, I can't think of any other reason why it would do this other than the gum out moved all the nasty crap from the bottom of your tank to your filter.