Hi I have a 2002 f150 and if been having trouble with it. Sometimes when I try to start it will krank but it will take a couple of sec to catch. Another prob I had before is if I pull a trailer it will feel like the truck is shaking when I'm going and I give it more gas. I also brought it to a shop for a compression test and all cylinders are running on 60psi. It also burns a little oil but doesn't smoke. I just have to add a little bit every once and a while. Are all these problems connected or do I have a lot of individual problems? Any help is very much appreciated.