1997 Buick Lasabre Custom - Changed TPS , IAC, MASS AIR FLOW, COOLANT SENSOR, MODULATOR VALVE, Code Reader Is P0122 & P1406.
PROBLEM-IDLE HIGH / TRANSMISSION NOT SHIFTING / STALL WHEN DRIVING, WHAT COULD BE PROBLEM????
Had same problem i would check the Idel Air Valve and also check all of your vaccum hose lines makeing sure there are no cracks or splits in rubber connectors if there is repair immediatelt because over time they start to dammage the internal parts fo the engine and if youve replace tps mass air etc. sounds like a vaccum hose problem
Try cleaning your grounds under the hood: under Ignition Module bracket, rf fender behind battery and lf fender in front of windshield washer fluid bottle.
I had similar problem and this fixed it.....grounds are very important for computer.
I used a carbon conductive grease on the connections to keep them from oxidizing.
Hope this helps you out.
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will not shift from 2nd to 3 rd
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