2003 Chevy Express LOW COMPRESSION ON PASSANGER SIDE PISTON

Hello,

i have a problem with my 2003 chevy express van v8- 6.0 Lt.
107,250 miles on the van

was driving fine until stall on the freeway now wont run at all, has water coolant, oil, etc engine will start but will not drive will not stay on unless I keep my foot on the gas, I already checked fuel filter and change with new one no go, also checked fuel pressure OK, checked cylinders compression and all 4 cylinders on the driver side are showing 175 psi on each, and all 4 cylinders on passenger side showed 45 psi each, I also did a wet test for each cylinder and no go, still showed low compression on all of the passenger side cylinders, at this point I don't know what could be the problem I already changed spark plugs wires spark plugs, is till no go, any help will be greatly appreciated.