The suburban will shut down completely going down the freeway, or the city roads. It sometimes does it when your at a stop sign and start to go its sluggish and jumpy and then just dies. We have changed the fuel filter. We hooked it up to diagnostics and the fuel compisition sensor popped up twice, so we had that changed. This still hasn't fixed the problem. Tomorrow we will change the fuel pump and see if that will fix it. Don't really know what else to do with it.