1989 Cadillac EL Dorado 89 Eldorado rough running

Ok first off how did you time it? DId you take a paper clip and jump term A and B at the Diagnostic connector near the parking brake pedal just below the dash? You should have saw a message that said "set timing" in the driver information center.
Now as for the TPS setting you can either enter the diagnostic mode throught the climate control panel with key on engine off tps reading shoud read.5 -.5 if not then loosen the screws that hold the tps and adjust it till it does. If this can't be done then you will need a digital multi meter and a paper clip, back probe the dk blue wire at the tps with the paper clip and then hook up the multi meter and set is on the 20 volt scale. With key on engine off throttle closed it should read.45 to.5 volts and at wide open throttle should read 4.5 to 5 volts. Let me know how it goes.

A E036 trouble code is an EGR pintal position out of range code. This usually means that the EGR valve and system must be cleaned or the egr valve has failed.
The E021 is a short in the signal wire of the TPS. Look for pinched wires or shorts in the signal wire.
Either one or both of these codes will cause the engine to run rough.

Ok if you would check the ohms on your coolant temp sensor. Do this cold and simply unplug and ohm across term on the sensor not wire harness and then get back to me with the ohms and the air temp at the time of the test.

The cooling fan control module needs to be tested to see if it working as it should. So check the orange wire going in for power and we will take it from there. The fan module is on the bottom of the upper radiator support on the right (passenger) side.

Ok so tell me how many fans do you have 1 or 2? Do they work if you turn on the A/C? Yes that looks like the cooling fan module. Get back to me so I can walk you through the proper test thanks.

Ok check the ohms of resistance between the black wire (next to the orange wire) and ground let me know what you find. Then after you check that I need you to back probe the green wire and then run the car and get up to temp (don't let it over heat) and with you volt meter hooked up do you get power there when up to temp where the fans should come on? Then check the brown wire. If so then the control module is bad. If you get no power then we need to check the engine control module and the body control module to see which isn't sending the power. Let me know what you find.