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03 Chevy Tahoe 5.3L vin "z". It started by randomly dieing. I checked the fuel pressure and it was low so I replaced the pump assembly. After it ran great for 2 or 3 days then it started dieing again. After sitting for several hours or sometimes overnight it will restart and run for anywhere from 10 seconds to 10 miles but never restarts immediately like before. I have rechecked the fuel pressure with the new pump and it is perfect. However when I checked for spark (with a ignition tester) there
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