Hi so I have a 2005 Dodge Stratus SXT coupe and it has a 4G64 2.4l engine, I'm debating either a Mivec 4G69 head or a 4G63 Mivec head. Currently in its stock condition I'm having some issues with holding rpms in gear and upon acceleration, had 2 trouble codes and now they're gone but the problems persistent P0455 Gross EVAP, and one says Exhaust catalyst too cold, I've installed a new fuel pump, lines, injectors, rail and pressure regulator, also have a terrible squeal and occasionally lose power steering even though the belt, pump and tensioner are also all new, if anyone could help me figure this out it'd be greatly appreciated. I'm a Mopar guy so this Mitsubishi stuff is a bit different, my last car was a 1967 Dodge Polara sedan with a 383 and a TCI built 727, dana 60 and 3.23 suregrip not used to working on anything with fuel injection lol

Freshly washed, and Yup Megan Racing fully adjustable race wing