Hi as above on a rs turbo zvh with haltech management when you start the car from cold and let it idle it will idle for a little while ok and then start to miss but if you pull the ht leads off the plug and just rest it ontop of the plug it will run great and wont miss the car drives perfect and idles perfect but if you plug it back on it will miss again, any ideas?

Ive tried new msd leads and 3 diffrent sets of plugs and makes no differance so dont think its anything to do with these