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1988 GMC K3500 Sierra SLE 7.4L HIGH idle
If truck is in gear with foot on brake, RPM's are at 750 for transmission load. If shifted back to Neutral or Park, RPM's go to 1500 and will not decrease unless ignition is turned off and restarted. Parts replaced: O2, CTS, IAC, MAP, TPS sensors. Throt...
FIX posted 1/21/2000
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| VIN | 2GTGK39N9J |
| Engine | 7.4 L / 8 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / TBI |
| Emissions | US FED |
| Symptoms | High Idle |
| Occurs | Cold, Hot |
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Vehicle Data
1988 GMC K3500 Sierra SLE
| VIN | 2GTGK39N9J |
| Engine | 7.4 L / 8 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / TBI |
| Emissions | US FED |
| Symptoms | High Idle |
| Occurs | Cold, Hot |
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