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Rough acceleration

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by usmcanson, Aug 19, 2006.

  1. usmcanson

    usmcanson Registered Member

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    87 357 tbi. Idles great. After driving for 5-10 minutes blazer no longer wants to accelerate. It cuts out, if i let off the gas it continues to run and idle fine but that is it. If i have to drive it i have to take off very slow and continue. Even when parked it will not rev up. It acts as if there is a rev. limiter kicking in at around 2500-300 rpm. :confused:
     
  2. 1985_K5_Silverado

    1985_K5_Silverado 1/2 ton status

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    Is the ECM tossing out any trouble codes?
     
  3. usmcanson

    usmcanson Registered Member

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    It's giving a code for O2 sensor...that's it. Today it actually stalled. After letting it set for a few hours it started and took me back home. I have a feeling that it it the fuel filter
     
  4. Thunder

    Thunder 3/4 ton status

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    If you are getting a code 44 (02 sensor lean exhaust) Yeah try replacing the filter. Should replace the filter every 10-12 k miles for best performance.
     
  5. bigblock72

    bigblock72 1/2 ton status Premium Member GMOTM Winner

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    Sounds like you may have a fuel pump checking out. Replace that fuel filter if it's very restricted it can kill the fuel pump. The other things I see on those are bad distributors, plug wires, and coils. The easiest thing to do is connect a fuel pressure gauge and go from there. If the pressure drops below about 11-12 PSI than the pump is bad, if the pressure doesn't drop then go to the spark side.
     

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