I posted on here in September with "2006 Dodge Stratus V6 Engine Light Issue". The vehicle now has 106,xxx miles.

Since then, the misfire issue is very rare but the code is still in the system even after wiping all the codes after replacing the Evap Purge Valve in late October. We replaced all spark plugs and coils as well.

The Check Engine Light has been off for three weeks after being on everyday since late August.

This morning the engine light has returned with the same P0300 and a new code of P0420. We are wondering if these codes are related in some sort of way.

This car has had engine issues non-stop since July.

If there is anyone who is able to understand what is going on please let us know!
Thank you!