I have an 86 IROC that I put a new 350 in. When I start it up for the first time, it starts no problem and fires right up. If I drive around for awhile and shut it off, it won't start, it will crank over but will not fire. If I let it sit for 5-10 minutes it will fire right up. I'm not sure if this might be a starter problem. Any suggestions, cuz this is a pain when I drive down the street to fill up and I have wait to start my car. Thanks for your help.

 

If you got crank, starter should be find. Sounds like a fuel issue. When mine did the same thing turned out to be the "Fuel pump relay". Luckily it was that and not the pump........

 

So why waiting the 5-10 minutes, it will fire right up? It's getting fuel, it's just got that sluggish crank when it first does it, the I wait and it fires right up.

 

You didn't say sluggish crank at first... When it's running what's your volt meter showing?

 

Showing normal range right around 13-14.

 

You might have to insulate your starter from exhaust heat, what are you running headers or what.