My engine lost power after a high rev. Only at low RPM the engine is really jumpy like, and the whole car shakes. When I turn it on it idels just fine untill the car warms up and the RPM needle drops all the way down and the car wants to turn off. Once getting it going on the road it sounds just fine. So i decided to do a compression test. 1.2.4 are all showing good compression. On 3 the compression needle did not want to move at all. just wondering what causes low compression or what you guys have to say? I plan on opening the head this weekend and take it to see if theres any valves that are the cause of this. what would a rebuild consist of? I would like to do just a OEM rebuild.?