HELP damn caravans

i have a 94 doage carvan and it always seems to stall while i'm driving, skips, and jerks as i drive, the little oil lite alwasy comes on when this happends, can anyone help?

Cycle the key from off to on (not start) three times leaving it on the third time. Count the flashes of the service engine light on the dash. Flash, flash, pause, flash is MIL code 21. All codes are two digits. Hopefully, you will have a stored code and it will give us a clue where to look. Let us know what pops up. Which engine and transmission do you have? Cold or warm engine make any difference? Welcome to the forum.