My car is shaky every time i hit a stop light?

Very common. GM has issued a service bulletin for this. Read this post

http://ricksfreeautorepairadvice.com/service-traction-message/

fix the anti freeze leak --before you blow a head gasket

what your codes mean

Check Engine Light On, P0300 Random Misfire Code. A random misfire means your engine is misfiring, but that the problem is not isolated to one or two cylinders. It is jumping around in a random way from one cylinder to another. A random misfire code usually means the air/fuel mixture is running lean.

What the P0700 code means. P0700 is set when the PCM detects a malfunction in the transmission control system. This malfunction causes the vehicle to set a Check Engine Light and trigger a failsafe mode. Once the failsafe mode is set it will remain until the fault is repaired or normal operation is detected.

PO133 Oxygen Sensor Circuit Slow Response (Bank1, Sensor1)

The check engine light flashing is a pretty much universal sign that you have a misfire that is bad enough that a lot of raw, unburned fuel is being dumped in to the Catalytic Converter, to the point that it could be ruined if the problem is not taken care of very quickly.

Have someone check the computer for trouble codes. The flashing light means the problem is serious enough to cause damage to the catalytic converter.

Need to have it inspected by an alignment shop to be safe .

Or the timing chain or belt. Not sure what year we're dealing with. Shoot a timing light at the crank. If the mark isn't staying in one position, you have a timing belt issue, and it will have to be replaced. Could be a valve or the cam, too.

Does the abs light come on when pulsating? if yes then maybe you have a bad ABS sensor or it just the sensors cleaned . Where they turned under spec .which means more likely to heat up and warp or crack

yes the rotors may only be 6 mo old, but it does not mean they didn't become warped in this little bit of time! try to think back if u had to slam on the brakes at some time to avoid some thing and hitting a big puddle of water and then hitting the brakes hard can warp them easily, i bet if u have them checked u will find they have become warped! ( could also be the quality of parts, it does happen) good luck to u,hope we helped.

it could be the timing chain, taking it to a dealership or mechanic who can hook there computer up to it and read the fault code would be your best bet though

what is the tune-up history? has the engine lite been scanned for codes? even if the lite is not on at the present it will still store codes for diagnosis. autozone will scan codes for free