I went to the LHS and put the truck in the shop due to Iam not sure what Iam doing. They told me that the piston and sleave was bad. It was sticking and the top. Is there a way to get it not to stick or is it sopose to be tight at the top? With the glow plug out and heat sink off the sleave slides up when you turn the flywheel. Can someone give me some info on this please? Thanks alot.