New yorker assistance required please

[fifthave92]

1993 new yorker fifth ave v6 starts but dies immediatly. If i feather the throttle I can get it to run but run badly flash codes of 12 and 21. Sons car his words were at a friends started car died started again and ran fine then otw home started running rough and said he had to keep his foot on the pedal to keep it running. First issue i saw was it was very low on gas. put 5 gallons in it cycled the key 3-4 times same issue checked the fuel shradder had fuel there. The only work done to this car was the solonoid pack and speed sensor on trans. Also listened and the fuel pump appears to be working can hear it run when the key is turned to on. Hope someone can lead me in a good direction thanks

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[fifthave92]

messed up sorry its a 92 3.8L. Work ive done this afternoon was removed bat cables cleaned reinstalled checked o2 map tps pcm and tcm connectors all appear to be tight. Switched the fuel pump relay with the one from the starter to see if it followed all ok there. Checked all fuses all ok at this time. Tomorrow ill bring a test light and fuel guage home.