2002 Honda Civic Power Loss

2002 Honda Civic. Since the winter time I have had a problem with engine power when driving after the car has been idle for some time(ex. Parked at the mall). It'll start but once you start to drive it'll start to sputter, like the engine isn't getting fuel. I'll be pressing the same amount on the pedal but not much happening. I can floor it and it'll pick up and won't happen after the initial 5 mins of driving. Mentioned it to the dealer when I had an oil change but they could not duplicate it, no surprise there. Ok so I did use a fuel system cleaner and replaced the sparkplugs but the problem persists. I've heard it might be the timing as well as the idle control valve. Any ideas? Thank you