I do not think that the EGR valve or PCV could have an effect on your situation. I would check the air filter and spark plugs first since they have most effect on this. You might want to clean the throttle plate and behind( T. Intake Cleaner)> helps throttle response. I got a new(universal) catalytic converter on mine today, overall 100$ which improved agility from low rpms a lot. But like the other guy said get it checked> Exhaust Vaccuum Test to see if it is restricted or plugged.