hey guys my vl is a na auto and runs rought at idle its got brand new plugs and leads rotor button and dizzy cap ive done the lead test checked all engine sensors changed airflow meters ecus checked all vacumm lines i noticed while checkin the timing with a timing light when i get it on 15deg it jumps around from 15 deg and upwards could this be a fuel pump issue or cas ??? any help would be great guys

I would say CAS related.

Checked the cas plug and it looks corroded and white mite give it a good clean il let yous know what happens

problem sorted had a dodgy injector