2004 hemi 5.7 misfire

Got code p0300 and p0303 multiple random misfire and cyl #3 misfire. Sparkplugs are Champion gapped at .045". Has anyone ran into this problem? Fuel injectors are firing when they're suppose to.

check compression, possible broken valve spring.

Yep, I've seen the broken valve spring problem. Mopar has an updated set of springs.