1993 Oldsmobile Cutlass Car sat for 1 year

Hi,
You have helped me before with several cars. I hve a 1993 Olds Cutlass Supreme, 3.1 Multiport, 6 cl. That sat unused for about a year. We know it needs a battery at least, but we cannot get it to start with a jump. About 6-8 weeks ago I got it to start and run. When I put it into drive it stalled out and won't start again. We got some help from the local auto parts store. We changed the oil and filter and now the auto parts guy recommends changing the coil, but I seem to find 3. What do you suggest we try. The motor turns over, but slowly.