I have swapped the CVH in my 1990 mk 4 xr3i for a 1600 silvertop zetec. I have used the original fuel injection set up as on the last of the mk4's but with an adaptor plate between inlet manifold and cylinder head and a spacer in the inlet to raise throttle body above the cylinder head cover.It uses a coil pack and individual injectors like the zetec does. The problem I am getting is that when I start the engine it starts no problem and revs straight up to maximum without applying any throttle. The obvious thought to me is that it must have a huge air leak but I have checked and cannot see one. Does any one have any ideas what could be causing it however obvious as some times you try to look to deep into something and miss the obvious.

Regards K