have 99 Corolla,developed a mis-fire,have changed plugs,plug wires,injectors,air filter..have cleaned intake,IAC,o2 sensors,cat converter(s)?have swapped coil pack with a different one,swapped vapor sensor w a different one( one on top w 2 phillips screws IDK what it is says vapor sensor onit or something similar , my point is that nothing has changed it or stopped p0301,please don't tell me that is a misfire cylinder 1,I understand that. It will crank and idle fine,when I put it in drive or reverse it starts to lug,or miss,or hesitate jerk and stutter pick ur adjective,upon putting it in P or neutral it immediately idles fine again...wtf?