Im working on a 1993 cutlass ciera 3.3L it was missing pretty bad and i changed the plugs and wires also i change the fuel filter still missing but not as bad as before i only gaped the spark plugs at 040 and i found out that they need to be gaped at 060. When ur driving and step on the gas it hesitates and when your just coasting along and u step on the gas " i'd say half a pedle or so it seems to slam into gear and even if u dont give that much gas it still does it and hesitates " but if u easy on the gas it does not do it all but a high school girl will be driving the car when i fix it.

That 3.3 liter buick engine uses the magnavox coilpack and they are prone to failure. They will give you a weak spark and the engine will be hard starting when it gets to be 30degrees out or colder. The spark output will dissapear when put under a larger load (steping on gas 1/2 throttle or more) causing the engine to misfire at that time. those engine always ran rough at an idle so dont take that as a definate skip. you will never get that engine to run so smoothe that it doesnt wiggle a little when just standing there looking at it. due to the lack of spark and power when it looses spark when moving and giving it 1/2 throttle or so, the transmission will jump into passing gear or 3rd to 2nd(downshift) suddenly because you are giving it the command to by giving it 1/2 throttle. fix the skip and the transmission will prabably act normally. you can usually tell if the coilpack is bad by removing 2 oposing spark plug wires and using a multimeter on the ohms scale, ohm the coil posts out and you should have aproximately 15,000ohms. if you have more than 18,000 or less than 12,000ohms you definately need to replace the coil. the car could have many diffrent problems causing what you have described but my money is on the coilpack. I worked at the G.M. dealer for 15 years and have replace MANY of them.
Good luck , Scott
P.S. - Yes , regap your plugs to .060" but that will not cause he skip