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  1. Bigkon35s

    98 k1500 with 5.7 Vortec emission monitors

    I have a 98 k1500 5.7 Vortec I’m having issues with four monitors evap, cat, htr and egr. I have done the drive cycle multiple times only recent work I had done was lower intake manifold and custom cat fitment for shorty headers I’m not sure what issues looking for help
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