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Help with Negative Fuel Trims
I could use some help with this supercharged Regal. Went to a muffler shop for a bad cat. The muffler shop replaced the cat, but it still runs really bad so the muffler shop brought it to us. The engine oil smells like there is gas in it. The fuel trims are wa... Login to read more. 
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52 Replies Received
52 Replies Received
| Engine | 3.8 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2004 Buick Regal GS 3.8L
| Engine | 3.8 L |
| Trans | 4-speed Automatic (Electronic) |
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