I have a jdm motor with 49k miles and cylinder 4 seems to get no spark I switched the plugs from one that was and still nothin and did the same with the coil pack and still nothing it seems to get gas when I start it up I can smell it and when I'm stopped at a red light can anyone help me diagnose this problem and thanks oh and it has a bad idle like they go up and down and shakes the whole car like it's camed out but it's not ????? Would green corrosion on the throttle bodie and ptu cause this to happen with the idle and misfire I have not tested the injector on cylinder 4 would I just unplug the connector and hook up my ohm meter also thanks again for any help.

 

test for voltage at coil pack connector, and yes you can unplug the injector connector and ohm it out, good is between 10-14 ohms