The car misfires on all cylinders on the passenger side (1 through 4). Cylinders 5-8 hit perfectly. I did a compression test and cylinders 1 and 2 read about "105psi". 3 and 4 read about "90psi". Could this be a possible head gasket issue or valves? The plugs are black and wet. Cylinders 5 through 8 look normal. Cylinders 1 through 4 ARE getting spark to the cylinder(new plugs/wires) Changed Distributor Caps and still doing the same thing. Coil is good (MSD) Gas is getting to all cylinders.