from the 1997 Riviera I pulled my 3800SC from, Before I pulled it, it was putting out a code (Can't remember the # now) that the MAF was bad. the engine is now all rebuilt but I have not bought a new MAF yet. If it is indeed bad, what would the engine act like ? Thanks

AND, being that it is a 97 engine, wired as a 98,(98 computer) which year MAF to buy ?

Sympoms of a bad MAF depend on how badly the MAF is corroded or failing. Typically though, you'll have some form of hesitation and poor performance.

When the MAF just short of fails, the car is almost undriveable there's so much hesitation and stalling.

95 - 98 use the same MAF sensor. AFH50M-04

when I got the car, it "Started up and idled perfectly" just had NO power, foot to the floor it was like a really Anemic 4 cyl fiero. would get up to about 45 in about 1000 feet. 1995-98 the Same, does that include Both SC AND N/a ? or are they different ? Thanks