Hello everybody been fighting this problem for months now,easier to explain what I haven't done ,only gets a code when idling for a while in closed loop,sometimes ,po 300 most of time it jumps differrent cylinders rough idle, excellerates without issues,Starts great,I have replaced and checked vaccum lines etc Ok what I haven't done.
Have not checked fuel pressure,crank,can,knock, sensor hasn't been changed,rear ,02 sensor not replaced and ecu not changed yet.Everything else done literally..thanks