vauxhall zafira 1.8 16 valve 51 reg?
 
                had diagnostic check done by vauxhall dealer was told needed new coil pack and clean throttle pack , have done this but car still misfires and revs go up and down , when i push throttle to drive engine dies right down and can only do 10 - 20 mph
any feedback would be helpful 
 thanks chann
            
             g chann
            
 January 2008