1998 Random missfire 2.4L engine

[twasem]

Can Anyone Help Me ?
This is bad I'm a ASE master and this one has me.
Step one code read p0300 random missfire
check compression 125 on all cylinders
check fuel press. 62 psi
check and replace fuel injectors
replace fuel pressure release valve
replace fuel filter
fuel system checked out ok
still same problem
replaced spark plugs, wires, coils, coil holder, crank sensor, cam sensor
ran top engine cleaner thur engine
still the same problem
pcm check ok
ign. control test ok
cat convertor Ok
vacumme lines replaced and check ok
air filter Ok
tested all wiring in engine compartment
still have random misfire
HELP !!!!!

[Cavalier2000]

hows those 02 sensors, they may not throw a code

[twasem]

o2 check out ok when checked with the scan tool they are in the area they are to be