Whistling noise from rear of my 1998 Old LSS

SOURCE: 95 Ciera Hesitates & stalls when warm

Change the IAC the idle air control. You may be able to clean it and put it back on.

SOURCE: have to hit starter 2-3

When you say you have to "hit" the starter, do you mean literally? If so, then you need to replace your starter. I've had several cars where the starter went out and if you bang on the starter it will usually start up. That wouldn't have anything to do with your fuel pump or idle sensor. Replace your starter.

SOURCE: i have 1991 Oldsmobile cutlass Ciera had oil

Bad connection at spark plug and wires or coil pack. Possible a plug got cracked on the install. Possibly the wires were installed incorrectly.

SOURCE: car cut off and will not start

Since spraying starting fluid in the car it runs, tells you that the problem is fuel related. You need to check the fuel system step by step completely. It seems you have done some of the checks already, but you don't say weather you checked if you get fuel on both sides of the fuel filter. If you only get fuel on the inlet side and not the outlet, your fuel filter is clogged, so replace it and recheck. If no fuel on either side and you say the fuel pump works check the fuel pump relay. Don't just replace the computer before all checks are made the relay, fuse and grounds, etc. This can be tiresome but can also save alot of money if you check system and don't skip steps you'll find your problem.

SOURCE: JUST CHANGED WATER PUMP, POWER STEERING PUMP, BELT

the damper could be bad if it's the type with the rubber inbetween the pully and the the rest of the damper. check that and see if it is separated. if not looks like your crankshaft bearings could be bad