laggy throttle and redline
 

Hey, im new to this site and new to the blazer world so iff some of the stuff i say dosnt make much sence i apologize. With that said i recently purchased a 2000 chavy blazer 2 door ls (i belive its a zr2?) And everything is fine and dandy exept for two thing. Whitch are number one is the throttle dosnt seem verry reasponsive, almost like it has an electronic gas pedal. And number two is when accelerating if you kick it down it seems to like almost hit a rev limmiter at 3500 rpm and wont shift or anything. So im wondering if its like a dirty mass airflow senser or what, cuz the one on it does look a bit crusty. So any info or help is much apreciated thanks!