No power to move 92 metro

I just picked up a 1992 geo metro, it has been sitting since 1999 it is in need of brakes and that is not a problem, the problem that I ran in to is that after a new battery I got it started and had it running and changed the oil and tried to drive it and it had no power once it was in gear, here is a dumb question I after witting for over seven year ther is very little gas in it, would a tank of fresh gas and a can of seafoam clean her up and get her running right again? is there anything else I should do to get the car running strong again.
Thanks for any help.
Hans

Yes fresh gas would help.

Is it possible its trying to take off in 2nd?

I will try the fresh gas and why would it want to start off in 2nd? today I found that I have a cable that runs from the tranny into the firewall and its not the shift linkage, I called the dealer and they told me that is sounds like the range select lever cable? what is the purpose and the use of this.

Thanks for any and all input.
Hans:banghead:

range select lever cable?

I ask that because ive had one and got rid of it because half the time it took off in second gear, wich means a kid on a skateboard could outrun me for the first half block.