Power loss, surging/bucking under load

Discussion in 'General Chevy & GM Tech Questions' started by dsquared, May 7, 2012.

  1. dsquared

    dsquared Member

    I have 97 K1500 with 258K miles and I have low power with bucking/surging under load. I don't believe it is a clogged cat since at times it runs with normal power. There are no engine codes. Idles well. I haven't checked the fuel pressure yet but will do today, what should the pressure be at idle and at any other rpm I should check? Let me know if these other things could cause the same conditions:

    Weak coil

    Lazy/bad O2 sensor

    Timing chain

    Vacuum leak (best way to check?)
     

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