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Take it to a transmission specialist for propper diagnostic
check fuses and relays, check for power at the switch, if all good replace switch...
Usually pretty simple, Its under the dash attached to brake peddle..
Problem may be ignition switch..The start signal from the switch to the relay may not be working.. Have someone hold key in start position and probe the rela plg with test light or volt meter..
check your owners manual, it will tell you what it needs. If you car has less than 50k you shouldn't need any, unless it's leaking..On another note I personally use Prestone..
yes, it sounds like head gasket has gone bad..
wont turn over, or wont start?
fan may not be working, check fuses and or blower resistor..
Are you using a K&N air filter by chance? As they have been known for killing mass airflow sensors on GM vehicles.
go to local autozone, they will scan codes for free then post here so we can advise..