Hi there, I'm new to Passion Ford, and just bought a 2002 Focus ST170 about 2 weeks ago.
Absolutely loving the car, but have a weird issue, which I'm sure is probably something experienced before...


The car under heavy footed acceleration literally just cuts all power in certain gears and only when hitting certain RPM's, for example in 2nd at about 4000RPM etc - As soon as I fill up the petrol tank the problem goes away.
As I get just below half a tank of fuel left the issue starts occurring again.


Any advice would be appreciated, thanks.