Fuel injection questions

I just read most of the posts again. My thinking is if the MAP sensor is bad, or vacuum line not connected to the intake, the mixture goes full rich. It is possible to test the MAP sensor, just 3 wires. It has 5V power, output and ground. You can use a meter and mity-vac to test. With key on, using meter on, verify that the sensor has 5V and ground, the other terminal will vary from a few tenths at high vacuum to near 5V with no vacuum.

If the engine coolant sensor is open or unconnected, the fuel will go rich, thinking it is sub zero.

There is a key on off sequence to read fail codes via blinking MIL dash light. Switch key on, off, on, off, on keep on. MIL will blink, count blinks that occur, longer pause separates codes. They end in 55. I think Allpar and othe places list codes, they are fairly standard for 80's Mopars.