Error code PO306 etc.
Got a 99 3.0 4x4, one year ago. Its been good to me until recently. Had ABS fail, shortly after I got intermittent roughness and power loss, constant CEL and flashing CEL under load. Sea foam in gas tank, changed plugs, they all looked ok but old. Ran like a champ, then next time I drove it was rough again.Took it to a reputable shop, says code PO306, and back checked the ECM. No pulse to cyl. #6. Bottom line, they say I need a new ECM, recommend a factory rebuilt for $500 or so. Also said probably bad injector may have thrashed the ECM. Any link to ABS/ speed sensor? Any insight appreciated. Thanks for sharing.