Right got a slight prob car was fine till timing on dizzy got messed up so got it so it ran fine but its now started to over fuel as it smell of petrol now when i start up and my exhaust is well sooty.also it backfires when turn off

now to me it sound like its doing it because off timing then am i right????? cant see how it would be to do with it but i aint sure. i need to get it set up but no point at mo as its going into storage soon till the summer
forgot to say its still mfi inj