new we4 purchase and am doing the spring cleaning suggested on this site. so far i have found ngk spark plugs, a completely clogged pvc system, tps out of adjustment, and im sure there is more. pulled the vc breather and noticed skirts around thesprings and yellow stripes on the spring itself. i was told it had a roller cam in it, is that realistic with the skirts there? i read the entire pcv discussion and purchased the plastic valve at the zone and no check valve, is this correct? thanks in advance for any advice or input.