Hey guys im new here...just a tech question ...wifes got a 04 gran prix .. non sc..trans feels as it intermittently slips at low speed or initial accelleration from time to time ...no codes fluid and filters fresh .. anybody ever had this problem...70k miles ... never had catalytic converter replaced ... should of replaced it when i worked at the dealer...but never had an issue ... just asking befor i pull the trans...thanks all