Need help have spi missfiring
My wife wagon is a 2000 se wagon with spi engine. it started sputtering and missing like water in the gas. I put dry gas in it cleared up and ran fine for 2 days. Then it started missing like bad coil so today I changed the coil plugs and wires. It then would not run that well. I read the codes and the only one is o2 sensor bank1 sensor 2. am I misssing something car is high mileage but it was mostly highway and the compression is still good. I did check it and for timing belt slop and no issue. I am confused I thought sensor 1 would cause missing not downstream sensor2. Anything I am missing????
Help she needs for work and to hual the kids around