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2007 chevy silverado 4.3 v6 4X4

When ever i get into second gear slow or fast accel. the engine make a loud spitting noise. It also does it time to time on the interstate at high mph. any ideas on what is causing this?
 

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You might want to check your coilpacks to make sure you're not getting missfire.
-Check plugs
-Check wires
-Check coil packs
-Check computer to make sure you're not getting any missfires
-if all fails take it to the stealership and let them rip you a new one.
 

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I would also recommend contacting your local dealership for more information if you are not able to pinpoint the concern. I can also look into this for you with your VIN. Feel free to contact me via private message as well. Thank you in advance.

Tricia, GM Customer Service.
 
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