I replaced some vacuum hoses and the PCV valve. Now the car sometimes disengages the cruise control or sometimes I can't get it to work at all. The cruise control/signal switch was replaced a year ago. The car also hard-shifts from gear to gear or when I put it in reverse. It happened less so after I changed the PCV valve. There's also a plastic pipe that goes from the air intake hose to the back of the engine that seems to be loose but I can't seem to be able to get at it and see it clearly to be sure. Any ideas?