fuel can get in the bores via the fpr too-it fills the inlet manifold sucking fuel via the burst diaphragm
cheap fix if it is-well for a cossie lol
injectors can stick open with ecu/driver issues etc-an ecu is cheap now too
have a wee check of the fpr vac pipe...
edited to add it could be a short on injector wire-earthing it out keeping it open the minute igniton is on