misfire and power loss tried injector cleaner now i hear a little rattling from on 2005 BMW 645Ci

engine what should i do next

Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer
See if you can get the codes pulled from the DME (engine control module). Power loss (especially at higher RPMs), misfiring and rattling sound could be a sign of catalytic converter failure.