what does the code p0305 and p0740 mean on a pontiac grand prixx gt

Before pulling that torque converter clutch go threw the wiring to the trans, sometimes its just a exposed wire touching & rubbing on metal. The misfire; check the spark plug for resistance and see if its running rich/lean/hot/oily/moisture on it ect, test coil for low/no voltage out to that cylinder, look for oily coil & cracks or swelling plastic casing(if coil usually will be 2 cylinders are misfiring), check/replace the wire set to spark plugs if one is bad, fuel injector weak or leaky may need cleaned or replaced or its wire harness is shorted/open/connector loose/dirty. Vacuum leak on intake manifold near that cylinder, Worn Rings/Valve Seals,