This only happens in the mornings after the car has been sitting overnight-- after startup and driving for about 2 miles, the engine seems to slightly surge as if a couple of injectors had not been working and they finally kick in. The injectors, plugs, wires, distributor cap, rotor, and fuel filter were all replaced 6 months ago. The car doesn't miss at all when driving - only a slight miss at idle. Any thoughts on this surge after about 5 minutes of driving? Cold start valve?