This one has me stumped

[Scott Girvin]

OK, so I put the new valve cover on today and checked for leaks. Everything seems to be good. I went out for a drive to double check for leaks and I noticed the boost peak at WOT and then drop at WOT. I know this is problably an intake leak but could it have something to do with the new valve cover? I put a new PCV in the valve cover and there is no catch can mod, just a filter on the intake breather thingy. Any one have any ideas?