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1991 Cadillac DeVille 4.9L MIL Lamp on
With scanner hooked up codes 30 Idle speed control and 91 Park/N are displayed and the Rpm are about 3,000 and then after awhile,the idle will return to normal for a while then it may take off again, also these codes will go away at times, untill you kill ...
FIX posted 3/3/2000
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Message Closed
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| VIN | 1G63D53B7M |
| Engine | 4.9 L / 8 cyl |
| Symptoms | MIL Lamp On |
| Occurs | Always |
Trouble Codes
| 30 | Idle Speed Control |
| 91 | Park/N Switch |
Message Closed
Vehicle Data
1991 Cadillac DeVille
| VIN | 1G63D53B7M |
| Engine | 4.9 L / 8 cyl |
| Symptoms | MIL Lamp On |
| Occurs | Always |
Trouble Codes
| 30 | Idle Speed Control |
| 91 | Park/N Switch |
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