chevyk1500

I have a 91 k1500 chevy 5.7 w/ a tbi. Since I got the truck and even after replacing the motor I have had an issue with the truck stalling. It stall at a stop while in drive and it stall when in reverse if I am not giving it gas. I have replace the IAC and a few thread have said replacing the ignition module have solved this problem for them (did not work for me). I have also run injector cleaner through my gas to see if that would help and it has not. So before I tear apart my tbi and try to scrub it down I am looking for any other possible issues. Thank you in advance for the help.