someone had previously tuned the ecu and i would like to put it back to stock to try to locate drivability issues. I am having an odd part throttle skip and would like to rule out the tune before throwing parts at it for no reason.

Its a 2010 Cadillac CTS performance it has the E69 bosch ecu. If more info is needed please let me now, any help would be great.



Thanks in advance,
Derek