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    jump A+B=13 not 12?? + Poppet Valve IP Question

    2 Questions - 95TD GMC Sierra Xc 4x4 Vin S ::: When I jump A+B (OBD1) it starts with 1-3/1-3/1-3 the codes then 1-3/1-3/1-3 end ! WHY am I getting a 1-3 flash when it should be a 1-2 flash ? Should I be concerened! I Cleared all coded (pedals & retested DTCS & got again 1-3/1-3/1-3 then 6-2 x3...
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