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I have a 2003 trailblazer and about 4 weeks ago I put a lot of stove pellets in it and something happened I started to leak gas! I figured I most have put a hole in my tank from putting too much weight in it. So I pulled the gas tank and saw that one of the two elbows coming out of the pump was leaking. I ended up replacing the fuel pump but when I put the new one in the engine light came on and is blinking “service engine soon” and it seems that it’s sputtering a little. Brought it to autozone and had a code checker done the checker gave me a 307 code any ideas??
 

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2002 chevy trailblazer_lt
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You are missing part of the code.
It is likely a code P0307 and you have a cylinder 7 misfire. That could be a range of possibilities. Spark plugs, ignition wires, coil pack, mouse chewed wiring, dirty injector etc.
 
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