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Pontiac Grand Prix GTP Questions

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Car will not start since yesterday already tried jumping the battery from two other cars was unsuccessful. When I turn the key to the on position it seems like the control panels trying to get electricity to start but when I turnThe key to the start position I get nothing absolutely nothing. When the doors open the sound from the dash goes in and out like a loose connection. Was finally able to get it started when was jumped by a tow truck but the card died within a few minutes after it was released from the tow truck..I am not sure if it's the alternator due to all the electrical problems that I'm seeing inside the car. This is the first time it has happened.
I am not sure if they are all related.
i noticed when i was flushing my brake lines(i was doing that because i was changing my brakes and calipers and troubleshooting why i had no brakes) that a sensor was unplugged from my master cylinder. i plugged it back in (my master cyl. had been the cause and took it to a local shop (northshore auto repair in belfair) to have it replaced as i was a bit intimidated. upon getting the car back and have the hack try to blow smoke up my bum, i asked him to come out and show me how to "bleed a sensor" ha ha... i lifted the hood and noticed the sensor had been again unplugged. hmmm i plugged it back in. and left. I don't have abs and the error message comes on all the time and makes my "parking brake on" light illuminate as well. this drives me crazy. my brakes are needing to be done again and i want this to go away.
My air filter was changed out to accomodate a K&N round filter, before i bought it, and twice i have almost catastrophic random cylinder firing error messages on the the message center. each time i have to pull over shut off the car and sit, then disconnect the battery to reset before continuing on my way. Each time this has happened when i am speeding up for a hill or stepping on the gas to pull out on a rural road into traffic. i have owned the car for two years and it has happened two or three times but it would happen more often except i can feel it and i ease up on the gas. i have never had any codes read because i have had to clear them to get going again. my car now has 99k miles and it happened at50k miles and at75k.
2004 pontiac greens prix gtp. I had rebuilt 2 yrs ago. I drive to 40 mph and it revs high?? I have no idea what's happening now. Anything from anyone would help. Thank you
My mileage is averaging 20 mpg. I have an insuffient erg flow code. The rpm fluctuates I have replaced the mass air flow sensor 4 times and the egr valve was replaced and a new throttle position sensor. It helps for awhile and then started having problems when it got cold.
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