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severe loss of power.

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by DaneW, Jan 7, 2003.

  1. DaneW

    DaneW Registered Member

    Oct 1, 2002
    Likes Received:
    Washington State
    I'll start off by giving alittle background. I reecently bought a 1976 K-10, the previous owner swapped in a 454 and a th400 in place of the 350 and th350. When I bought the beast I love the endless amount of power it had in the low rpms. After owning it for three motnths now I have noticed a dramatic loss of power. When I bought it I could smoke my 35's on dry pavement at will now I have trouble spinning them on wet pavement. I don't know if this is due to running cheap gas or what. Maybe a tune up is in order. Any help would be greatly appreciated. Thanks in advance. /forums/images/graemlins/truck.gif
  2. Can Can

    Can Can Pusher Man Staff Member Super Moderator

    Feb 17, 2000
    Likes Received:
    Cochrane, Alberta, Canada
    We need a little more info, brother.

    Is the truck running rich? How do your wires look? What about your cap and rotor? DO you have a catalytic convertor? How does it start and idle? Does it backfire or run-on when you turn the truck off?

    The first two places to look when performance goes south is fuel and spark. It sounds like you have to do a wee bit more checking before we can offer opinions.....

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