first off blew a head gasket changed it.......bad compress in 4th cylinder.....now reading 175 psi on all cylinders....computer wouldnt let me diagnois codes....replaced it.....checked timing to see if distributor was 180 out......not tha problem.......then tested fuel injectors all tested good 16 ohms resistance.....brand new fuel pump.....all cylinders getting spark.....????.....so whats the problem