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2006 Chevrolet Cobalt Questions

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No airbags went off The lights and dash lights come on fine its just when I turn the key to start it nothing happens what could it be? Ive tried to jump start it and it still wont turn on
I lost the gas cap on my 2006 chevy colvolt now it has. No poer uses alot of gas and no power stering can no gas cap cause these problems
Car cranks but no start and will not fire up at all (no engine warning lights where on). 1/2 tank of gas, can hear fuel pump engage in gas tank when key turned to on and gas squirts out of schrader valve when stem pushed in. Electrical - had battery tested and was not in the best of condition so I bought a new one. Put it in and no help (didn't think it would). Than I replaced the 4 spark plugs and coil wires and coil and ignition module, no start just turns over. Ok, so prior to putting the coil wires in I tested each one and got spark on each wire (I know first hand because I accidentally touched the screw driver I was using as a ground with my tester and got shocked. I don't feel bad purchasing these parts plug, wires, coil because I look at it as giving the car an overdue tune up. Hoping not a timing belt but have doubts since car died without engine noise and I am getting spark. Now I am looking for suggestions. PS. getting tired of driving wife to work.. Thanks
2006 Chevy cobalt 2.2L

Codes- System too lean

So my car flipped out. Doors locking and unlocking, has trouble shifting, speedometer and RPM meter jumping up and down. Mileage meter Ian going faster than the actual miles Ive driven.

At first mechanic told me that he fixed a vac leak and that I needed new spark plugs, a oil change, and a new fuel filter. Code came back quickly after he fixed the vac leak and now he says I need a new o2 sensor. Could the fact that the engine is running under poor conditions cause the electric system to freak out?
This warning has never come on before I changed the starter
2006 2.2 5 speed cobalt with new engine due to warped heads.
Bought the car used came with new pump to put in. I did and no power going to fuel pump. Replaced computer board and fuel sensor. Will not crank
The alarm goes off anytime I open the doors ortrunk I'm trying to figure out how to disconnect the system I have no need for it and it's try annoying. I have a key fob but most of the buttons don't work and i neveruse it anyway. I just want to disconnect the whole anti theft system
I changed the catalytic converter and a couple 02 sensors ..is this the timing chain?
Check engine light not on. Tires are new. Alignment fine. All fluid levels fine. Just passed emissions. Sound does not let up when the accelerator is. Only stops when the car slows down under 30-35. 100075 miles.No loss in power but sounds like whirring..
I have replaced the map sensor and the mass air flow sensor. I still get the code and still have idle issues.
I got the thermostat housing off but the bolt stud is broken and its flush so I can't remove it how can I get it out and what do I need to remove to get to it
Every once in awhile I will be driving my car and it will misfire and the check engine light will come on.
Every time I am driving I hear a rattling sound when I hit a pot hole or on a uneven road.
When I apply the brakes to stop my car, it wants to almost shutoff.
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