[coupe]

The previous owner of my vehicle was running on leaded fuel.
I was reading on the Haynes manual that in order for the oxygen sensor to work, the engine must always run on unleaded fuel.

Could the oxygen sensor be damaged causing rough idle after the engine has warmed up? The Haynes manual also says that the oxygen sensor is by-passed until the engine reaches it;s normal working temp. The engine does seem smoother when cold.

Can any of you comment please...