2007 Cadillac CTS still misfiring after a tune-up and replace the coil. What can it be?

Question

2007 Cadillac CTS 2.8L still misfiring after a tune-up and replace the coil. What can it be?

Answer 1

HI there,

You may have a problem with the fuel injector on the cylinder that is misfiring or a problem with the engine internally. For that you would have to check the engine compression. It is also possible there could be a problem with the intake manifold gasket leaking.