why are you asuming its over fueling?

RS's will dump fuel like a bitch on start up any way bud so if it isnt fireing you will have the smell of fuel

checked CPS sensor?

have you checked spark or even power to the coil packs?

unplug each loom to the coils and vault test them for power, if they have power

check the coils are ok, remove 1 & 3 plugs put long ingnition leed on the plugs one at a time and check for spark if they have spark 2 & 4 will be ok also as coil works to plugs and will never faill just one

so you now have spark? or not if not you've sorced issue

now check fueling, injecters maybe fooked, leaking

remove fuel rail, to torques bolts iirc, place rag over rail and a towl over battery turn over engine, if all four injecters are fueling correcty you'll guiesstimate there worth by seing them throw fuel

if leaking you'll have O-rings on injecters that are fooked, seat rings for rail also check, to place them back in, heat in hot water to reshape then place back in inlet manifold whilst cooling and theyll resit in manifold

you now have fuel and spark but no firing? CPS sensor bud or also check TPS bud, but recomend you check all sensors first save you hard graft.