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Miss - No Load Driving & Reversing

Discussion in 'Engine & Performance' started by LuvNLife, Jun 30, 2020.

  1. LuvNLife

    LuvNLife Junior Member

    Posts:
    9
    Likes Received:
    3
    Joined:
    Jan 10, 2014
    Location:
    Crossville, TN
    First Name:
    Jerry
    Truck Year:
    1985
    Truck Model:
    C10 Silverado
    Engine Size:
    350
    I need some help brainstorming a problem, rather than tossing random parts at it.

    '85 C10, with a new Chevy 350/260 long block. At idle, it's smooth as can be. Drop it in gear, same. Accelerate lightly, and I begin to hear a random miss; don't really feel it bucking or anything, I just hear it. Driving steady state at like 25 mph, same. Pull out on a main road, throttle response is fantastic, half pedal and it pulls great, with no hint of a miss. At steady cruise, 55-60 mph, runs and sounds great. So long as there's a load, like a small hill, it sounds great. When I drop it in reverse to back up my 150' inclined driveway is the worst. Not only do I hear the miss, I feel it bucking. The truck also smells pretty rich at idle, but zero black smoke.

    Here's the hardware I have: engine with less than 200 miles on it, Edelbrock Performer EPS intake, 1/2" wood carb spacer, Edelbrock AVS II 650 (no choke) carb, fuel pressure regulator set to 4 pounds, Patriot shorty headers, 10mm new plug wires, R45TS plugs, new (inexpensive) HEI connected (now) to ported vacuum, valves lashed to 1/4 turn past stopping of "clacking". The trans is a Turbo 350 with about an 1800 stall converter (was in the truck already).

    Thoughts and recommendations would be appreciated.
     
  2. gotyourgoat

    gotyourgoat Full Access Member

    Posts:
    1,427
    Likes Received:
    2,042
    Joined:
    Mar 27, 2014
    Location:
    NRV Virginia
    First Name:
    gotyourgoat
    Truck Year:
    1984
    Truck Model:
    c10
    Engine Size:
    smokin' 305
    Has it been like this from the beginning or it took 200 miles to appear?
     

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