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1989 Chevrolet C1500 Cheyenne 4.3L Cuts out, Misfire
I have (I believe) narrowed the problem to erratic spark control at the ignition module. The problem occurs most of the time, although every now and then the engine will run just fine. What happens is the ignition either drops out momentarily or spark duration...
FIX posted 7/20/1998
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Related Documents & Media 
| VIN | 2GCDC14Z9K |
| Engine | 4.3 L / 6 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / propane mixer |
| Symptoms | Cuts Out, Misfire |
| Occurs | On Accel, Idle, Intermittently |
| Misc. | 2WD Pick-Up Converted to Propane |
Trouble Codes
| 43 | Electronic spark control ESC circuit |
Message Closed w/FIX
Vehicle Data
1989 Chevrolet C1500 Cheyenne
| VIN | 2GCDC14Z9K |
| Engine | 4.3 L / 6 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / propane mixer |
| Symptoms | Cuts Out, Misfire |
| Occurs | On Accel, Idle, Intermittently |
| Misc. | 2WD Pick-Up Converted to Propane |
Trouble Codes
| 43 | Electronic spark control ESC circuit |
Video