My car randomly misses and bogs down and at red lights it sometimes revs up and lurches forward when holding the brake down. I have put a new fuel pump and filter, New alternator, plugs and wires, and a new coil. The transmission sometimes shifts hard but has never slipped or anything. The car has 263k miles.
This sounds like a vacuum leak. Of course if the check engine light is on, the first thing to do would be to pull the engine trouble codes and post them below.