1993 Buick LaSabre. Out on road at 70mph, tried to put on cruise control, didn't work at first, then it did. Then car started to shake like road very bumpy then lost power then power came back. Check engine light came on. Dial about transmission usually never goes over 3, shot up past 4, then down again.
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Re: Buick shakes, guns then almost stops
This sounds very much like a torque converter/transmission issue. i will assume the transmission dial you're speaking of is the tachometer? which measures engine revolutions per minute. to confirm, one could possibly unplug 4-wire connector on transmission near radiator and test drive. this keeps the transmission from going into torque converter lock-up.
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Either the cruise control is going out or the torque converter clutch circuit is going out on the trannys overdrive. Do you have check engine light codes? If so you will need to have a computer hooked up to read them. Darrel coleman also has a problem with his car like this and I have suggested the same thing to him
the cruise control switch comes out of the steering wheel. you can use a small flat head screw driver to unwedge it from is hole in the steering wheel. there will be a wire attached to the back, lift the clip holding it the wire to the switch. installation is the reverse.