While driving at highway speeds car seems to drop rpm's and goes back to normal with in a few seconds. I can get it to stop doing this by giving the car more gas. Problem will go away on it's own and doesn't come back for a week or two, sometimes longer. The car has 132000 miles with new injectors, fuel filter, EGR valve, plugs, wires, and fuel pump speed control relay.
Thanks in advance for any help. jayjay