Calling on V10 Gurus!
Ok, 99 V10 2500 QCSB 4x4 AT. Has 123,000 miles on it. Bought it super cheap, running rough. Fuel gauge didn't work and fuel pressure was low. Replaced fuel pump, fuel pressure is good, gauge still doesn't work (not the main issue). I've replaced Cam sensor, crank sensor, intake gasket, pulled all injectors, cleaned rails and replaced all O-rings. New plugs, wires and coil packs. Pulled and cleaned TB, replaced IAC, TPS. Replaced both cats with a new exhaust (2 1/2 dual into dual cats, y-ed into 3 inch in/ 2 1/2 out flowmaster super 40). New O2 sensors. Truck still runs rough at an idle, slight backfire out of exhaust at idle as well. Truck runs ok at lower RPM's when truck is cool, gets worse as truck warms up. Also bogs out hard under heavy throttle and has very little power... I'm thinking replace injectors but as a full time student that's kind of a big investment, so I'm just making sure I've covered my bases before pulling the trigger! Any ideas?