2000 3.0 ranger ff bad head gaskets?valves?

[2000rangertony]

for the last few months i have been battling this problem ,was getting a running lean code,then lean & 2 ,4 cylinder mis fire,then back to lean code ,now ,2,4 cylinder mis fire check engine light on,runs rough,temp gauge jumps when idling i have replaced plugs,wires,fuel filter,all 02 sensors,pcv,took it to pep boys for engine diognostic codes they got were
pcm.p1000OBD 2 SYSTEMCKS,INCOMPLETE.PO302CLYINDER 2 MISFIRE DETECTED PO306 CYL.6 MISFIRE DETECTED and failed block test...i also found a rust color in the radiator that built almost paste like under the cap,idles rough obvious miss seems to run much better as i accelerate just find it hard to belive it could be both heads I NEED SOME HELP/ADVISE thanks

 

[2000rangertony]

2000

2000 Ford Ranger 3.0 Flex Fuel

 

[Quiksurf]

i put two heads on my 95 for issues like that, just do a compression test and you will likely be low. likely valve train