my 2003 Chevy trailblazer runs for about 10 miles then just shuts down and will not start again until about 3 hours later. Runs good while running. Have had fuel pump, fuel filter, ignition switch changed out. Put in new computer in.

Hello, you've replaced a lot of parts, but what testing have you performed? It sounds challenging to replace all these components and then not get anywhere - for sure. What needs to happen - testing has to be performed while the problem is occurring. You'll be able to check to see what's missing when the stall happens - fuel? Spark? Air? Electrical power? Once you know what is missing, you can drill down to the root cause. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.