Hello I just had to do a head swap for my 2.4L turbocharged pt cruiser. New head with valves and springs, replaced oil pump, water pump, plugs and wires, coil pack and timing belt. Car say sat for a few months because the head got warped due to high temperature cause oil pump went out. Now that I have it running it has a surging idle that I can't figure out. All vacuum lines seem to be fine no cracks or wear. When I take the vacuum line off the brake booster the vacuum just surges instead of a steady sucking. Has anybody ran into this problem or might now of which route I should take now?