Hi, I have a 52plate ST170 which runs fine when cold but once the temp goes up to normal it starts to run rough .
the rough running is really bad, to get it to go you have to rev then back off of the accelerator then it will go slowly ..

i have changed lamba sensors checked for air leaks , new plugs and HT leads , havent changed the coil pack as i don't want to spend the money unless i am sure its faulty .

Any ideas ??

thanks
Bamp