We took it to a shop and paid 90$ for them to plug it into the diagnostic computer. The only alert that came up was the O2 sensor. However, that wouldn't cause the problems it's having which are: Shuddering and backfiring when I accelerate, even without a load; dying frequently when i try to start it, back out, or drive at all (wasn't doing this until we got the oil changed. barely made it out of the shop's parking lot.); oil light sometimes comes on when I slow down to 20mpg or lower; Check engine light occasionally comes on.
HELP!!!!?!??!!!!
HELP!!!!?!??!!!!