Hi guys help need with my 302w seems to start shuddering and sounds like it missing as soon as i start to drive it, but it idles ok and revs ok any ideas cheers.

Does it get worse as revs rise?

yeah sort of only when i drive it not when its in park.

Could be off the mark with a wealth of electrical probs it could be, but, don't rule out harmonic balancer, I started my NF to move it up the drive one night and thought it was a bit grumpy, the next morning it seemed to be missing quite bad, took it straight to mechanics and they checked for missfire but couldn't trace it, but after talking here on fordmods with everyone they said try balancer ...and bingo! it had slipped causing the whole engine to shake just like a miss!