1994 3.3 leaking fuel out of exhaust

So I have a 1994 Intrepid I am working on. Has a definate misfire. I replaced the #5 injector about a month ago because the plug was soaked with fuel so I suspected a stuck injector. All was fine for a short time but now the problem is back. It is pouring fuel out of the exhaust. I pulled codes and came back with 12 27 51 43 and 21. I assume all are related to this problem. I'm guessing its a wiring or pcm issue. And ideas? Thanks guys!

I would inspect your fuel pressure regulator. The Rubber diaphram could be worn out

84, the pcm may be overcompensating for a lean mixture, Have you checked for vacuum leaks and all the basic sensor checks. As always start with the simple stuff first.

You probably know this anyway but here goes codes 21 and 51 are due to the o2 sensors, 12 is battery power disconnected, 27 is injector driver not responding and 43 is ignition coil not responding to control command. Seems like a lot but it deserves checking out.

Thanks for the reply guys, but the car was dismantled and its prolly a Kia by now. Never did solve the issue though...