Q: My check engine light is on , and my truck has been sputtering every so often . It has also starting to have hard time starting

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My check engine light is on , and lately has had hard starting issues. It also sputtered not while idleing but when I'm going and not all the time , but it is getting more frequent. 2004 Chevy Silverado 4.3 liter V- 6.

My car has 142000 miles.
My car has an automatic transmission.

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