i have a problem with my zafira?

i have a 1.8 16 valve 2001 zafira wich is misfiring and running lumpy i have had diag test done by vauxhall told me it was coil pack and throttle pack needed cleaning which has been done but still have problems when i tryt to drive it will only go 10 - 20 mph

help me please!!!!!!!!!!!!!!!!!!!!!!!!!!