ive just spent 7k on a rebuild on my 2003 sti import its running on gems ecu
but all of a sudden its developed a missfire in cyl 3 & 4 1&2 are running lean and 3&4 are running very rich by the colour of the plugs ive checked for air leaks found none changed plugs still the same coil packs ok really stuck here any help will be great
thanks peter

 

turns out it may be the cam sensor putting back now will update later if this solves the problem

 

at last problem solve after changing ecu damm thing still missing changed 2 injectors on cylinder 3 and 4 then missing stopper but i dont understand why 2 injectors went down at the same time

 

Glad you fettled it mate.I do like a happy ending