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hello there Ronnie i want to thank you for all your patience help and information. late entry sorry , just to tell you i finally fixed the car.I change the crank sensor,i think it was good but its done and even if i change last year the coil ignition, there were still a problem it was not working again i also had a fuse ignition in the engine bay blow now the car doesnt stop anymore running fine working ,thank you very much, as i dont have anyone here around Quebec who own a buick reatta ,hard for me to have help of someone who know all the car, its a really good site here have a good day:)

Thanks Ronnie - really appreciate you taking the time and photos! Will check with Jim.

It sounds like the time torque converter is locking and unlocking. It is normal for it to unlock at speed if you release the throttle or drop below a particular tps value. The ecm does this on purpose as it is preparing for braking. If you coast down for an extended period, the ecm will cut fueling, called deceleration fuel cutoff which will cause the tach to drop a little and then back on. I would drive in diagnostic mode and watch the torque converter indicator to see if it is on and off during this sensation and also watch the tps for what it is indicating. It is the direct indicator to the ecm what you are doing with the throttle