Hello i hope someone can help me out i have an 2003 neon and i am having several codes come up they are :

PO303 this was the first one i got then they tended to grow after a while i know this is a misfire and i believe i changed the plugs and wires and cam sensor as that was a code i was receiving it worked ok for a couple of days then went back to its old tricks i now also have codes:
PO300
PO303
PO700
PO720
these are stored codes?

and on top of that it says these are pending
PO300
PO303
PO700

im not sure what that means but i assume it means the stored codes have been in a while and the pending coes happened on the last trip.
i hope the transmission codes are simple fixes and not a teardown of the transmission any help would be greatly appreciated.

 

https://dodgeforum.com/m_409789/tm.htmhere all the codes for 2000+ neon it is at the top of the 2nd gen forum just for future reference