1999 olds alero, olds alero, independent garage

I was driving my car when all of a sudden it started to run rough i took it to get it scaned and it showed to be a map-baro sensor replaced it and it ran the same got it scanned again and it showed low circut input what does that mean my car is a 2.4L engine your answer would help soo much please help
                                                  Thanks
                                               Melissa

Answer
    That's just not enough info for me to tell you anything.  I will tell you that just getting it scanned by the Jiffy-lube isn't going to cut it.  Find a good, reliable independent garage and have them do a complete real-time look at the engine systems.  They'll find the problem.  If you could send me the codes you were getting, I might be able to offer some insight, but it's no substitute for real-time scanning of the system.
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