chankyeyes

When in 2nd gear, my civic tends to sputter if i put a substantial amount of pressure onto the throttle, it also occurs sometimes in 3rd gear. I have already replaced the air filter, fuel filter, spark plugs, and changed my oil/oil filter. Anybody have any ideas on how to fix this? I already have used two full tanks of gas with the fuel treatment stuff. Thinking of replacing my fuel injectors, my car has well over 100,000 miles so maybe its about time? Thanks.
Curtis