Check for vacuum leak or faulty EGR valve.
there is none its controled by the tps sensor located on the pleteum
You don't. A 1991 Cavalier did not come with airbags.
Behind the glove box.
without more info it sounds like the cluch may be worn. you might look for an adjuster for the cluch at the slave cylinder.
Behind the glove compartment.
70 ft-lbbs
No, at least not easily and legally. The 1991 has a 2.5 liter inline four related to the old Iron Duke, whereas the 1996 has a 2.2 liter shared with the Chevy Cavalier and the Pontiac Sunfire.
You don't, you replace it.
70 ft-lbbs
Check the fuse box.
Around 2300-2500 lbs
Chevy dealer, auto parts store, etc.