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  1. first gear judder / jumpy/ shaky 1998 GMC Sierra 2500 HD

    Most noticeable when truck is heavily loaded (full of bricks or full of wood).

    Somewhat less noticeable when not loaded, or when put into 4L.

    Somewhat told me there is a screw that can adjust...
  2. I am a fan of the MAF sensor cleaning. I've...

    I am a fan of the MAF sensor cleaning.


    I've discovered that it has a K&N filter, which can cause a dirty MAF sensor if improperly used.


    The idea of K&N filter doesn't appeal to me, even...
  3. well, the injection cleaner didn't help.. didn't...

    well, the injection cleaner didn't help.. didn't pass.
    i still feel there is something wrong (and emissions seem to prove it), but there are no engine codes.
    will look for a mechanic that can...
  4. Took the truck for a 50mile drive today of mixed...

    Took the truck for a 50mile drive today of mixed highway/hilly/town driving. Drives much better.

    Then took it to an auto parts store, where I took a computer reading.

    Besides "speed signal...
  5. Truck appears to drive fine now. It doesn't have...

    Truck appears to drive fine now. It doesn't have the occasional jitters anymore, however I do think it's somewhat weak in low RPMs.

    However, given that my other car is a mustang, and I've never...
  6. Haven't picked up the truck yet, but after O2...

    Haven't picked up the truck yet, but after O2 sensors were replaced emission metrics went down, but still didn't pass.
    Replaced plugs and wires, misfire is gone, but still didn't pass emissions....
  7. Don't you think it's unlikely that all 3 (or 4)...

    Don't you think it's unlikely that all 3 (or 4) oxygen censors are dead?

    From what I recall, the computer indicated that only one is dead.

    While I don't think the mechanic is incompetent, I'd...
  8. Shouldn't there be a logical sequence of tests to...

    Shouldn't there be a logical sequence of tests to narrow down what's busted, instead of replacing everything?
  9. 1998 GMC Sierra 2500HD won't pass emissions

    The truck was bought used.
    The mechanic says that all 3 Oxygen sensors need to be replaced.
    He said the test indicates that there might be fuel in exhaust.
    I indicated that I suspect there is...
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