- Sep 7, 2007
- Lawrenceburg, IN
- 2007 Black Z51 Coupe and 2004 Magnetic Red Coupe
My '04 coupe just turned past 50K miles. Outside of regularly schedule oil and air filter changes and chassis lubes. There's never been any engine work and it's still performing well. I am noticing that the engine sometimes hesitates to fire up on the first key turn. Is it time for a tune up, and if so, what needs to be checked?