I don't know if it's only in my head or what, but it seems like my03 is getting weak. It just recently clocked 80k miles and it doesn't seem to be picking up as fast as it use to. It's all stock and I regularly change all fluids, except for coolant, spark plugs and I just put in a k&n filter(it improved a little), but I've never adjusted the valves. Do you guys think it has really gotten slower or is it that I've simply gotten used to the car? Maybe there's other things that needs to be tuned up besides the valves?

 

Have tried resetting the ECU?