what i need to no is, you no the subaru's sound like there only running on three cylinders, how can you tell if it is running on three, as i have lost loads of power and it feels like am driving a kagaroo, lol.

 

does it also run on three/ bad when idling?
if yes then pull the sparkplugs one at the time. if there is one plug without the engine stalling or run even worse then this plug is the one failing.

 

yes it is bad on idling. and when setting off, will check the plugs when i get time, cheers for your advice, will update when i have checked the plugs,

 

finaly got it sorted, after buying new plugs and a set of coil packs and changing all the coil packs first it still ran on three cylinders so out with the plugs, found out they where three bosch plugs and one ngk plug? so i replaced with a set of ngk plug and put my old coil packs back on, now it's purring like a kitten,cheers to all that helped me out,