99tahoeinwv

99 tahoe, 5.7, other day i hopped in and it was running really rough right after start up. drove about 3 or 4 miles, dropped daughter off at work andheaded to advance to have it scanned since cel had come on. by the time i got there it was running fine. he scanned it and it was P1153, which apparently is not a specific code. so he cleared it and it ran fine all the way home, no light. jumped back in last night and it ran rough at start up again and light came back on. after it got warm, ran fine. had it scanned and it was p0308, cylinder 8 misfire. where should i start? i read that the p1153 could be drivers side front o2 sensor? i believe that is the only one i havent replaced yet, but that wouldnt cause cylinder 8 misfire would it?
thanks for any help in advance