First off- CAPS LOCK OFF. In the texting forum world that's considered yelling and rude.
Mass sensor = MAF for mass air flow
A typical cause of this problem is the wiring going to the coil. You should carefully inspect the wiring that goes to the coil pack plug-in connector. Pull on the individual wires at the connector. Sometimes these wires will be loose inside the connector. Ford makes a pigtail replacement (connector with wiring) that can be spliced in to solve the issue. We have also seen damage to the coil power wiring harness itself near the EGR tube that comes off the exhaust and goes to the EGR. Twist the wiring around to inspect because usually wiring damage is not where you can easily see it.
I don't think this is your problem, but you should check it anyway: grounding. At the negative battery terminal there should be 3 wires. The big one goes to the engine, one small one goes to the wiring harness, and the other goes to the chassis- usually near the battery. Somewhere on the top of the engine, near the back of the head, is the grounding strap. It looks like a copper shoe lace, and should go from the cylinder head to the firewall- I think the UK term is bulkhead. Make sure all that stuff is intact and where it should be. The main ground is probably not the problem, but the other ones can cause some freaky problems if missing or loose.
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