misfire on idle please help?

The core plugs in the cylinder head can fail on these cars. When the engine warms up the cooling system pressurises and a fine spray of water exits the cracks in the core plug joint and soaks the spark plug causing a misfire.

If this has happened on your car then the cure is to replace the offending core plug with a new one. Clean up the mating surfaces before you fit the new one.

See:

http://www.honestjohn.co.uk/forum/post/index.htm?t=64138

http://www.fordownersclub.com/forums/topic/35697-leaking-cylinder-head-core-plugs/

http://howtomendit.com/answers.php?id=133391

ChicksFan
November 2014

It is difficult to say what your problem is, you don`t say what the workshop checked or did but plugs, leads and coil packs would be worth checking out and also a compression test may be worth a go, good luck

cdc
November 2014