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I have a 2004 Colorado with the 3.5. I use this truck to deliver mail out of. It’s been a great truck. But it has started stuttering and wanting to go dead when I take off slowly. If I take off fast it does fine. Also idles great and runs great at hwy speed. It’s just when I slowly accelerate and also only does it after running for 4 hours or so. Once it cools off you can get it in and drive for 2 hours with zero issues. No check engine lights and I’ve already cleaned the throttle body and put a new fuel filter on it. Any ideas?
 

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CALI BOSS
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6,322 Posts
Check the MAF sensor. It may need to be cleaned or the connector has gotten loose. Also check the the wires are all seated in the connector completely. If that checks out, check your coil pack connections and the spark plugs
 
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