to you technicians out there, how in the world to replace the PCV valve on a 93 Lightning? I know it is behind the plenum...so how do you remove the plenum? I looks easy for the most part, except, how do you remve the plenum where it meets up the the throttle body spacer? It has 150,000 miles on it, do you recommend that I replace the PCV? There is nothing wrong with the way it is currently running, I am just performing preventative maintence. Also, were is the PCV Screen? Should I replace that ???