My wife's Tahoe has shutoff several times on her. I was driving it today when it happened. It acts like its out of fuel. The fuel pump relay was extremely hot. I swapped it with a similar one and got it cranked. 20 miles later same thing. This time it tried to idle around 100 rpm and sputtered until I cut it off. I loosened the gas cap thinking it may be a vaccum issue. Still nothing. After about 15 minutes of setting and trying it cranked. Had over half tank but decided to top it off. It's been idling and running smooth for the last 30minutes. I'll know shortly how it will handle the interstate. Anybody have any ideas on what could be the issue? Gas needle is close to accurate. Could pump be getting hot or going out? Thanks for your help!!