I'm guessing that's a Fiesta RS Turbo Stage 2 (aka 195) chip? Stu is probably on the right track. You may have another issue but probably needs a remap for the ZVHs increased capacity.
Stage 2 "195" chip on OFAC is 3.5 BAR fuel pressure at idle with the Vacuum off the regulator, which reduces to circa 3 BAR with the vacuum back on.
If you're running beige 701's and it idles fine, then it's a 195 Chip.
Lee