1984 buick regal t-type with tuber when i drive it with no boost it ok but when the boost come on the car spudder?

I am going to assume you mean Turbo. If it runs with no boost and is fine I would begin with two things. When the turbo is spooling does it make any noise or smoke? Secondly have you tried to spin the turbo with the engine off? If the turbo is fine and it only spudders under boost I would check your ignition system but first make sure your plugs and such are all good and gapped correctly as you may be blowing out the spark under boost. Very common with weak ignitions or big gap plugs.