startup noise

I’ve got a brand new Mustang GT with active exhaust and the 10-speed auto. It’s only got about 390 miles on it so far, and I’ve had it for just three weeks. I’ve noticed an odd startup sound every once in a while. The car seems to slightly stumble on startup and I hear a singe metallic knock...

I got a 2015 mustang and a few weeks ago I noticed that it wasn’t really blowing cold air anymore so I got one of those self charging kits, charged it, and it didn’t change anything. This was probably happening each time I started the car before then but I only recently noticed and it makes a...

A week ago I started having this issue during startup. The noise only happens when the starter is turning the flexplate. No ticking sound during idle or at speed. I did experience the noise a few times when I shut the engine off, but that seems to have subsided. No check engine lights and the...