Help... Subaru malfunction... Help

This issue started 3 days ago had a strong gas
smell.   It didn't have any get up and go, it kind of
reminded me as if it had a fuel injector problem or
a catalytic converter problem. When it is in gear
and just sitting there it is shaking and losing power
but never seems to die.  I went to put gas in and
realized my gas cap was missing.  Took it to
AutoZone and had it read on the diagnostic
computer and it read  cylinder 1 cylinder 2 cylinder
3 misfire each one of those were duplicated as
well as p0442 EVAP system large leak .040
detected. P0136 ho2s bank 1 sensor 2 circuit
malfunction.  P0128 coolant temperature below
thermostat regulating temperature. So I check the
coolant it was low and I feel that I got a gas cap
placed that on the vehicle and it seems to be
getting worse the check engine light is still flashing
somebody please help me with a roundabout
closer option than the 15 things to AutoZone
people told me in a way for me to buy one of
everything in the store.  Thanks in advance..