i think my fuel pressure regulator is playing up on my 2.0 zvh its using the efi from a fiesta rst and the regulator is attatched to the fuel rail. ive got an aftermarket fuel pressure regulator kicking about but its an in-line one. If i attach this after the oe one will this do anything? or will the original one need removing? if so i know you can fit one of a sierra cosworth and ive found one online but its 4x4, will this still fit? also can anyone reccomend any spark plugs for a 2.0zvh? many thanks