v8 injectors

ive been trying to trace a missfire on my 4.6,ive replaced maf,ignition leads,spark plugs,coils etc(cam is new)without any success,snap on reader states that it is misfiring on no1 and no8 cylinders.it also appears to get better the warmer it is.how reliable are the petrol injectors on these things?i notice that island 4x4 do replacements but ive never regarded petrol injectors as a service item before,is it plausible that the injectors have an issue?

If it is prior to 1999 model - the coil pack fires both cylinders 1 & 8...the later models with 2 coil packs, cylinder 1 is fired on pack 2 and 8 is on pack 1.

If yours is prior to 1999 it could be a the coil pack breaking down....but this usally happens when it gets warmer and not the other way round!

Injectors are usualy very reliable unless you run LPG when little use tends to gum them up a bit!

well to cut a long story very short,both coils are f+cked!both replaced a year ago(rangie only comes out to play in the winter) anyone know a good replacement which isn't sh++part or rebadged same?