If no exhaust leak, then it's likely as Gary Doug says, either an injector or O2 problem.
Because it's adding fuel, it would be a non-working injector. I'd pull the rail and makes sure they all spray. If they do, then try replacing the O2 sensor, if not replace or clean injectors that don't spray.
It might be worth cleaning all the injectors anyway even if they do spray.
On a side note: because you still have the AIR pump it could be pulling air in through that system into the drivers exhaust manifold. Because your cat was clogged it is possible that the exhaust pressure damaged part of the AIR system causing it to let air in when it's not supposed to. When I deleted my Cat, I also ditched the AIR pump too.
1995 Camaro Z28 LT1 LE2 355 w/ forged pistons/rods, 230/238 .565/.565" 110+6, 1.6:1 SA RR, LT Headers with ORY, T-56 (rebuilt w/ some upgrades), McLeod Street Twin, Lowered 1.25" (Stagg Shocks and Summit Springs) LCA Relocation brackets, Adj Panhard Bar, Poly suspension bushings, STB , CAI, !emissions crap, Magna Flow Cat Back. 146,xxx miles. Purchased Feb 7, 2012 (168K) 414rwhp
2014 Ford Focus SE Hatchback- Stock (Wifes Ride)
Last edited by hrcslam; 07-22-2014 at 10:42 PM.