Hey guys i am looking for some answers. My blazer was running like crap got a po300 code. I did a tune up ran great for 3 months....then started hard starting when humid. So i changed EGR and Coil. Ran great for 3 days started same crap again.....getting frustrated. normally after cranking a bit it would eventually fire. This time however it will not. any ideas? I hear the fuel pump running....seems like a spark issue where do i go?
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