blazer quits after warming up

when i start up my truck it runs great then after warming up if you give it more guess that prolly 2000 rpms it just says check guages and shuts off, i have had some suggestions so far but none have worked, in the past week i have done........a complete tuneup, new o2 sensor and throttle position sensor, new cpi injector and nut kit and new fuel pump and sending unit. Can anyone help me with this, at my buddies shop it seems to be a mystery, but they special in trannies

when i start up my truck it runs great then after warming up if you give it more guess that prolly 2000 rpms it just says check guages and shuts off, i have had some suggestions so far but none have worked, in the past week i have done........a complete tuneup, new o2 sensor and throttle position sensor, new cpi injector and nut kit and new fuel pump and sending unit. Can anyone help me with this, at my buddies shop it seems to be a mystery, but they special in trannies

Take it to a automotive shop, not a tranny shop.