Yes does sound like air ingress into the fuel system.Might be worth buying a genuine Purflux fuel filter (from GSF ).
My car has similar symptoms after fitting a pattern fuel filter - I have bought a genuine Purflux and will change it when convenient, dont be misled by anybody saying 'this filter is manufactured by a company in the same group as Purflux' - same group does not mean same quality !
My car has similar symptoms after fitting a pattern fuel filter - I have bought a genuine Purflux and will change it when convenient, dont be misled by anybody saying 'this filter is manufactured by a company in the same group as Purflux' - same group does not mean same quality !