Question about 1997 Buick LeSabre

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Transmission won't shift

Had problem with high idle got that fix
had problem with stalling when driving got that fix
but now it not shifting until reaches high speed goes to fisrt then into 3or 4 gear missing 2
had no problem with transmission until i fix high idle
have replaced tps sensor, mass air flow sensor, iac sensor, coolant sensor, modulator valve,
put a code reader on read code P0122 and P1406
have any ides what cause transmission problem?????

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What kind of car is this? how old is it,most trannys go because NOBODY seems to change the fluid .I would change it every 50k,after ten years of no new fluid . You could try changing it and add a bottle of Lucas trans slip fluid with it, I have used it with at least 4 differant vehecles with success. But check you trans kick down cable first ,if it broke the car will not shift,Located right with throttle cable,one on top and the other right under it .

Posted on Mar 03, 2013

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Throttle position sensor

Posted on Jan 07, 2009

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