Was driving earlier to see my mum as she has just come out from hospital, stopped at a junction and the old Seris 1 Rs started idleing from 1000rpm to 2000rpm flickering between the two....the engine was running really fast so turned back home.

I have a rattling tappet, would this cause a problem??
Car is booked for a cam kit change monday.

Any ideas?? need to solve before xmas as i iwill be skint till feb