car running horrible

[ban-one]

i started my 00 gt today and it was running horrible check engine light is on and blinking and its running on 5 cylinders had codes read and the evac code for small leak in fuel return system and the p0302 and 0305 for cylinder 2 and 5 misfire
it runs rough through the rpm band what could of caused this. as soon as i hit gas the check engine light blinks? any ideas

 

[MaxedGT]

Swap the cop's with 2 different cylinders. Clear the codes and see if the codes follow the cop's or stay at the same cylinders. While it's apart check for moisture or burning on the boots and plugs.

 

[Dragstr05]

An EVAP (as in evaporative emissions) code isnt going to be the cause for a misfire on 2 cylinders. If you meant the code is for a leak in the fuel system perhaps you should check that out; check fuel pressure if you can.

And as stated above inspect your coils it wont take long.