GM 3800 series 2 engine problem?

[c d.o.t]

i have a 96 Buick riviera with 160,000 miles on it. it has the 3800 series 2 supercharged engine in it. my problem is that when i go to throttle it up it has hesitation for a few seconds also has shuttering at times when i let off the gas. from what i know the intake gaskets suck on these engines but im not burning any coolant. Im not sure what is wrong with it didn't know if any one knew what could be wrong