Hi all, [car is 2008 1.4 corsa auto]

engine light (engine electrics ) started coming on intermittently, stays on and car runs sluggishly (I suppose in emergency mode), but then is not on when car is started again.

I changed the plugs and air filter and cleaned out the (partially blocked) breather hoses.

At idle, can feel a slight misfire or knock, can't tell under load.

Got hold of a code reader which showed no fault codes at first, but after the latest instance of the light coming on, now shows

P0303 cylinder 3 misfire $ 07E8pd Generic

Would this point to the ignition module?

Thanks for any advice,

Pete