EGR wont work proper if engine cant breath proper via intake and exhaust
0446 leads to a restricted evap canister, but take care of the running issue first, as back preesure in the intake could be pushing back into canister via purge when commanded and goofing the tank pressure values to PCM
Computers once again, another reason why this system of codes is crazy, and must drive mechanics crazy as well...
What happened to the good old days................?
A good mechanic, may have replaced the cateylitic converter, the egr valve the fueltank pressure sensor, the fuel filler cap, the rear subframe, the Canister purge valve, the spark plugs, the coils, the crank position sensor, the battery the alternator...
I reckon, this won't be the last time you see these codes
and after all that the cars are no better now then they were 25 years ago