Car stalls suddenly

the cap,rotor, and plugs only have like 500 miles on them .It was starting to get dark so Im going to change the ignition switch tommorrow . I just took it for a ride , I checked my TPS and was putting out .93 so I adjusted it as much as I could and got it to .96 . When I was driving I made sure to keep an eye on the tach and voltage guage, when I push the clutch in to make a stop the rpms drop to like 500rpms and the voltage drops to about the M on normal on the gauge . When I said the alternator was shot , I had it tested last year it was only putting out 50 something amps .
thanks guys for the replies
tom

so
The alternator didnt help ? Ive been saving to get the same thing .

Well I think its fixed, I cleaned the IAC and replaced the TFI module and hasnt stalled since . One more question my tach is still dopping down to 500 or below sometimes, and my voltage gauge is dropping quit a allot also . The rpms are dropping but its catching itself before it stalls . I have the tps set at 99 . Should I just get a new IAC , Im going to order a PA Performance alternator . Thanks once agian for all your help I really apreciat it .

tom