I did an afm delete on my 5.3 and replaced the camshaft with a 4.8l one. The truck runs well except it has a rough idle. No codes, no misfires but feels like a misfire. Changed the plugs, changed the wires, cleaned the MAF, cleaned the throttle body, checked the spark from each coil, did a smoke test for vacuum leaks. Still the same stumble at idle only.
Here are the specs in the camshafts. Where they are slightly different and if the timing change is the cause for my rough idle, could this be tuned out? Any help is appreciated. Thanks.
New Cam: 12689035
Duration: Intake: 190, Exhaust: 191
Lift: Intake: 0.466?, Exhaust: 0.457?
LSA: 114
LC9 (old) Cam 12588614:
Duration: Intake: 196, Exhaust: 201
Lift: Intake: 0.481", Exhaust: 0.481"
LSA: 116+2
-Jamie