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backfires in gear-454tbi

K5Glazier

1/2 ton status
Joined
May 29, 2003
Posts
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Location
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?
JOe
 
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