battery or starter issue?

[John]

I appreciate the suggestions. Yes the car has headers, starter is not stock. Battery, that is the first thing I want to check is age. When I bought the car I recall the seller said it was probably due to be replaced. My concern with heat soak, it's never did it over the summer when it was in hotter weather. However, I did drive it about 5-8 miles at highway speeds, just before getting gas. Not sure if that makes much difference with heat transfer from the headers, low speeds to shut down vs highway speeds to shut down. As I said, engine was at normal temp (about 165/170).

I agree-last think I will do is replace the starter. Need to check the basics first.