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Re: 1-2 shift shudder
Posted to Transmission Forum on 6/20/2019 1 Reply

I know this is old, but since many of us search for a fix, I'll add one. Short answer is intake gaskets and carbon in upper plenum, and also throttle body can cause this..read below if you like the long path..

2005 Buick LeSabre Custom w 3.8 and approx. 138K... Login to read more.

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