I have a 2013 Mazda5 with 95k on it. At first it was just slow to start for a few weeks. Now when you try to start it after it’s been sitting awhile, the rpms and speedometer both shoot all the way up and then back down. It refuses to start the first couple times. Then eventually you turn the key, the rpms and speedometer again shoot all the way up and then back down again, and it idols at around 1700. Any ideas?
We tested the battery and starter so far, and both appear to be fine.