[imc188222]

A bad starter is not very likely. Also if the engine is cranking very slowly you are not going to get a correct compression reading because the air will have time to bleed past the piston rings. Is your battery fully charged? If you hook another car up to it to jump start it does it turn over at a normal speed or does it continue to turn over very slowly. If you you had an amp gauge to check how much current the starter is drawing when turning the engine over that would tell you something but the you would need to be sure that the battery was fully charged or those readings would be thrown off as well.