so when i drive my car , it kinda like misses at certain times, under 75% throttle usually, and i have to hammer it for it to come back o life, it doesnt actually stall, but its like its missing, i ran codes and got an oxygen sensor code, but im not sure the sensors could cause such a dramatic problem. the gas milage is ****ty, so im not sure what it is. when it is "missing" the tach doesnt drop like it would if the pickup or tfi is bad. anyone got any ideas?