1991 Isuzu Rodeo Question 1991 Isuzu Rodeo rough idle

I have 1991 Isuzu Rodeo with a 3.1L V6 TBI. The car will start but almost immediately stalls. The injectors are pushing fuel. In order to keep it running, I have to give it gas. I have tested the throttle position sensor, map sensor, idle air. They are all fine. Also the fuel pump is working properly. I also replaced the pick up coil. Even after all this, it continues to run the same way. I am out of ideas and could use some thoughts as to what else to look at.