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P0300 Random Misfire Code
I have a p0300 flashing MIL only when the truck exceeds 65 mph. When you slow down to under that speed the MIL goes away. I put new plugs in it, still flashes. Idle vac is 18 in vac [...] pressure is normal @ idle. Can not check at speed. I used propane to che... Login to read more. 
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12 Replies Received
12 Replies Received
| Engine | 6.0 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2001 GMC Yukon XL 2500 SLT 6.0L
| Engine | 6.0 L |
| Trans | 4-speed Automatic (Electronic) |
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