I have a 2002 Dodge ram 1500 to 4.7 v8 I was driving it and it was running decent fine... Then all of a sudden just boom started smoking lost power stuttering a lot. after I got it home I didn't know nothing about diagnosing the problem so I just started buying stuff I replaced the water pump already I got coil packs plugs both O2 sensors map sensor and mass air flow sensor but when I started it's still stutters it throws a p0300 code multiple cylinder misfire... When I looked underneath the truck the catalytic converter is glowing bright red I don't think there's a compression on the left side? Any ideas? Powertrain wants 3,300$ for zero mile motor ...trying to avoid that if possible? Any ideas?