Thought I'd start a new thread as the old one is way too heavy reading.
Have been talking to Tabetha, LHD220Turbo and quite a few other characters on here trying to sort my red top 4x4 out.. Misfires.

I rebuilt/replaced my loom (quite pleased with myself too, saved a packet)as the bulkhead plugs could be manipulated to cause erratic idle.
All happy as f**k, jumped in after fitting the new loom, warmed the car up around town and then made for a bit of dual carriageway, come on boost, miiissssssssssssss
So, renewed fuel pump wiring, and while I was in the mood for it, renewed the fan wiring. Again, jumped in all happy as' again, but it's still there. New Fuel Pump, still there, new regapped(again) plugs, still there, renewed the battery to alternator lead, thought maybe voltage drop off under load, still there.

To cut a long story short, after assuring my advisers (see above) that I had checked all the usual suspects, and that I was confident they were all new or minty, I found today while fitting a new throttle sensor that my dizzy cap was cracked. Fairly new, from reputable dealer. Cracked right through to the metal track of one of the pick-ups inside the cap, number 4. Put a new one on, and with all the other upgrades/improvements made, she fucking sings now! Don't get me wrong, she's no missile yet. Only on 0.9 bar, standard t3, standard chip, panel K&N and scorpion 3". Just being able to give it some with any horrible intervention by the ford gremlins is such a relief... Oh yeah, should have called this thread
FAIL!!! A fucking cracked cap. Idiot.