My cuz's blazer started running ruff and degraded down to now it won't start. 6 month ago I did a tune up, so it has new plugs, wires, cap, and rotor. He pulled the coed's and it showed multiple misfires on multiple cylinders. They replaced the coil and maff with no luck. They asked me to do a compression and fuel pressure check. Compression is 180-185 psi fuel is 55 psi. I check the distributer and found one of the holes for the cap screws broke so I replaced it and the crank sensor with no help.
I don't know where to go from here. Any help will be appreciated!