backfires in gear-454tbi

Discussion in 'The Garage' started by K5Glazier, Feb 27, 2007.

  1. K5Glazier

    K5Glazier 1/2 ton status

    May 29, 2003
    Likes Received:
    Chandler, Az.
    Seached out this problem, but found no answers. It seems a few guys had this problem, but never posted any answers.

    Here's what I have.
    90 blazer, swapped '93 454 tbi, 700r trans.

    Idles fairly well, but as soon as I put it in gear, it backfires thru the tbi. I would have to feather the throttle just to get it to move.

    I had a 350 throttle body on it about a week ago and it moved fairly well except for it not shifting properly. Then I put the 454 throttle body (modified for the tv cable) Now I have the problem above.
    Any ideas?

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