I have an 85 Gti 8v. It starts up and runs fine and revs all the way threw in neutral fine. But when driving down ye road once you get to 3200 rpms it's starts to studer and hesitate. Like its skipping in a cylinder. It has brand new distributor, distributor cap, button, battery, plugs, and wires. I'm a little baffled. Any body have any ideas?