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I have a 2000 monte carlo ss 3.8 supercharged just did a swap from naturally aspirated to supercharged I just got it back from the shop ran perfect for one night the next day I went to go drive it it started and stalked out on me I can keep it going when on the gas but sounds bad and get a real bad smell of fuel coming from exhaust any ideas what this problem could be please help spent so much money an haven't got any where really
 

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So you had a "shop" do the work? Limp it back there if you're not responsible for getting it running.

If you want to diagnose/tune it, you know the answer... Get HPTuners, scan it, copy the tune file, and start making adjustments carefully.

Sorry to be blunt, but it seems like you ran to post here before doing any troubleshooting.
 

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I suggest you pressure test the engine, and also smoke test it to see if any vacuum leaks appears. U have to have a misfire from somewhere
 
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