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black soot

  1. 1991 s10 super hard start and black soot

    S10 / S15
    Okay so I did an engine swap in a 1991 s10 blazer LT Tahoe edition. The guy I bought it from said it struggled to run. Before the swap it had the same condition, hard start and black soot from exhaust. I replaced the egr valve and tps and it ran better so I decided to proceed with the swap...