Car judders through low-mid range revs, like a misfire. Last week the oil cap was loose resulting in a bit of oil in the engine bay but its bone dry now.

What to check? Plugs and leads are almost new.

Cheers

 

Ya dont say the spec but if uprated then check plug gaps should be 0.5-0.6 mm also worth checking leads and phase sensor gap/timing

 

Cap and rotor arm ?