My wife took my charger into the shop and there (technician) diagnosed my vehicle for having a bad thermostat ( which it never ran hot) and random misfires (couldn’t pin point which cylinder was misfiring) They want to charge a thousand dollars. So I went and bought the parts for 318 dollars and did it my self. ( that didn’t fix the issue) there technician didn’t diagnose it correctly As it tick is coming from the rocker arms under the valve cover.