Still missing after plenum fixed
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Im not sure how to start a new thread, 96 5.2l, 318,1500. Have had this problem for a while, I replaced steering gear box, pitman arm, idler arm and all tie rods, and even the drive shaft bearing. At my wits end! Almost put a for sale sign on it just because I can't figure out the bouncing crap. Tired of pushing O/D button every time I hit 50-55moh.
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Ok, broke this out into it's own thread. You can start new threads by simply clicking on the "new thread" button in the upper left corner.
Anyway..... If the bouncing goes away, or, at least, becomes much less noticable when you hit O/D off... that's an engine miss. Given some of your symptoms, I would suspect that the plenum has been bad for a while, and the cat is starting to plug up. Easy test is to remove the FRONT O2 sensor from the exhaust. (it's right on the engine side of the cat.) and go for a drive. (unplug it up above the trans, and just remove it from the truck entirely.) See if it runs any better. It WILL set an O2 code.
Anyway..... If the bouncing goes away, or, at least, becomes much less noticable when you hit O/D off... that's an engine miss. Given some of your symptoms, I would suspect that the plenum has been bad for a while, and the cat is starting to plug up. Easy test is to remove the FRONT O2 sensor from the exhaust. (it's right on the engine side of the cat.) and go for a drive. (unplug it up above the trans, and just remove it from the truck entirely.) See if it runs any better. It WILL set an O2 code.
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