4x420

I have a 93 4runner v6. It starts up just fine cold, runs for about 10-15 min and dies like you just turned off the key. i've got good fuel psi, ck it and it was about 40psi. it held psi after the truck was off like it should. i've got good spark, i put a spark tester on each plug and all of them are giving off good spark. i've replaced the tps sensor, egr, no change. i even put code scanner on it and it says there is no codes present. not sure what to do at this point. not sure if this matters or not ,but i replaced the auto tranny with manual. any help?????