help me out guys

Hey guys I just recently bought a 1994 cutlass superme sl 2dr 3.1 l v6 im having some problems that are really annoying.. I bought this car from an auto auction for 1100 it is great shape the car came with a fairly new engine put in it but i think when the genious's who put the engine in forgot to hook some stuff up. Welll My chime didnt work nor did the power door locks.. so okay i put the fuse in the 10 acc spot the next morning my car would not start soo i took the fuse out and car starts whats up with that ? next problem I think my alternator may be going the battery isnt holding a charge for long but it started the car so the other day i tried to start my car and started up but it was really really slugish it went from 900 rpm to 1500 rpm then back down to 900 rpm then just completly stalled out the engine started and ran fine 2 days ago what could have gone wrong in that time period.. also i dont drive this car yet im 17 and just bought it im saving for the down payment on insurance could some one please help me i know a decent amount on gm cars but this is very frusterating any help would be greatly appreciated
Ryan

hey guys I fixed everything my cutlass I replaced spark plugs can you belive this? when the car was serviced by the old owner he requested all the old plugs to be changed so the mechanic replaced 3 plugs he put bosch platniums in the front and in the back he left ORIGINAL ac delco plugs no wonder why it was running shittyI also replaced the engine coolant sensor that fixed my check engine problem and i left the fuse in for my door locks and the batt didnt die.. thank god all in all it costed me like 24 bucks to fix everything