It had a no. 7 cyl misfire code and also random misfire codes. I replaced the coil pack on 7 and new plugs and wires. No more codes but engine seems to be missing. Almost seems like a faulty coil pack still but the rattle concerns me
Misfire is no longer detected by computer so when you say misfire are you thinking misfire from poor fuel delivery (filter) or misfire from another possible cause.