1989 Cutlass Ciera Stalling problem

Insert a paper clip in Terminal A and B of the ALDL Diagnostic Terminal (Located Below the Drivers Side Dash). These are side by side top right. Pins are as follows on most of them.

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F E D C B A
G H M
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The system will flash code 12 three times (the check engine light) consisting of one flash, pause, and then two more. Following this it will repeat every code in the computer three times. Then it will flash code 12 again after all codes have been displayed. Good luck!

21 Throttle Position Sensor (Signal Voltage High)
43 Electronic Spark Control (ESC) Circuit

CODE 21
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Trouble Code 21 indicates that the Throttle Position Sensor (TPS) is reading abnormally high. TPS volts should be close to 0.42 V at closed throttle and rise smoothly in about 0.02 volt increments to a maximum reading of about 4.85 volts at WOT.

Code 21 will set if:
Engine is running
TPS signal voltage is greater than 4.3 volts
No Code 33 or Code 34
Air Flow is less than 17 gm/sec.
All conditions met for 1.25 seconds
Typical causes for this code include:
1) Defective TPS
2) Short circuit in the TPS harness to +5 volt reference
3) Open sensor ground circuit
4) Defective ECM

NOTE: Presence of codes 33 and/or 34 may indicate that the MAP sensor is defective and is reading less than expected. This may cause the above set-conditions to be met falsely and this code to be set.
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CODE 43
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Trouble Code 43 indicates that there may be a malfunction in the Electronic Spark Control (ESC) circuit. ESC is used to sense spark knock (pinging) and retard the timing to eliminate it. The knock sensor is located at the rear of the engine block. The ECM will retard the timing by as much as 20 degrees in 1 degree increments. A loss of knock sensor signal or loss of ground at the ESC module will cause the signal at the ECM to remain high. The ECM will act as if no knock is present, and may possibly result in engine damage, due to detonation.

Code 43 is set when:
Voltage at Knock Sensor is above 4.8 volts or below.64 volts.
Either condition is met for about 10 seconds.
Possible causes:
1) Open or shorted knock sensor
2) Loose knock sensor
3) Excessive mechanical noise within engine
4) Improper or incorrectly installed MEM-CAL in the ECM or defective ECM
5) Intermittent open in the EST line to the ignition module
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