A compression test on an engine that has sat cold for a month and all the oil has leaked down is probably going to be so inconclusive as to be next to worthless - and if he has never done one before, he won't know what he is even looking at. Not that this is a bad suggestion - but he really needs to have someone run the test who has done it before.
BillyBoi, you have a 2001 Focus but you didn't tell us the trim level or the type of engine so we cannot even start making any reasonable guesses.
Post the VIN and we can look it up and tell you what you have.
From the description is really sounds like you are running on 3 cylinders. These 4 cylinder engines will shake like the dickens if they lose a cylinder. This could be anything from something simple like your coil is shot or plugs and wires have trouble to something major like you lost a valve seat