Hi read just about everything realated to this problem but all suggestions have not worked for me list of what i have changed below

Plugs

HT leads

Coil pack

MAf sensor

ICV sensor

Injectors and rail

Hose at back of inlet manifold

and still got these problems Erratic idle, stalling when braking, lack of power got a mate to hook his scanner and its coming back with a missfire on 1 and 3 cylinders compression test we ran was ok, any ideas as to what could be causing this? cheers for any insights