i have a 04 i first got a p0033 code and had researched it and i got surge valve solenoid circuit but unsure kinda what to do im not having any problems with driving starting or anything but also right after that showed up i got a p0420 code which is catalytic efficiency but i don't have a cat on my car had taken it off 3 years ago but kinda weird i think to get this code after 3 years aint it? but also got to thinking it is cold down here in Mississippi so can that be an issue? and also im getting horrible gas mileage im only getting 90 miles to a full tank and its never been like that what is wrong with my baby please help