Hello there!I have a 2002 honda civic lx manual transmission with 81000 km on it.Recently i have noticed that when i press the acceleration pedal hard, the car doesnt speed up as fast as i press it.It feels like as if it doesnt want to go as fast as i want it and it takes time to accelerate to the point where i want it.It doesnt rev high anymore.I have changed the spark plugs, do my oil and filter change as recommended by the manual. This is a strange issue as when i want to accelerate on green light, it takes time to reach the speed. This problem just happened in the last 2 weeks.What seems to be causing this and is it expensive to fix?Thanks to anyone who answers to my question.