I have a check engine light on my 2007 Chevrolet Cobalt 2.4l engine.
Had the
codes scanned and they found P0171 and P0300. Lean exhaust condition and misfires.

What can cause this problem and how do i fix it myself.
I dont want to go to a shop since they are so expensive these days and I have a small  budget.

This problem should under warranty. It is common to 2006 and 2008 models also.  A common cause
for this is the fuel injectors are slightly restricted. The dealer will perform a
fuel injector balance test
and do a cleaning procedure. If the  injectors do not show improved flow, they will be replaced.

There is also a reprogram for the Powertrain Control Module (PCM).
I suggest getting in as soon as you can. With the check engine light on,l you will not be  able to pass
state emissions test, and can cause more problems with the way the car  runs.

If none of thee things fix the car, then you have a problem in the cylinder head. The valves and seats
may be full or carbon and are pitted. This will give a misfire and lean AT IDLE ONLY.

The cylinder head would need to come off, the valves cleaned or replaced, and the valve seats
repaired. If the head cannot be repaired, it will need to be replaced.

2002 Chevy Cobalt. I installed a new a/c compressor and serpentine belt.
After changing out a/c compressor, the clutch would not engage.  We checked
the fuse panel and found the fuse blown.  Put in one of the spares and it blew as
well.  We put in a spare 20w fuse and the engine stopped running.  The fuse
panel is getting power to the fuses on the outside edges of the panel, but not to
the fuses in the center of the panel.  When we hot wired the ign fuse, the car
started and ran fine.  what would be causing this.  Thanks.
If the A/C fuse keeps blowing, then you put a bigger one in, you may have
caused the original short to get worse and blow something else.

I think there is a fuse labeled "Powertrain" in the under hood box. If that is OK,
check all fuses. If they are all good, then you need to look for some melted
wires or possibly the fuse box itself is bad.
2007 chevy cobalt 2.2L Ecotch 4 cylnder,
Engine code engine poor reduced performance code P2176. Do i need to replace
them and where are they on my car
Not sure what you mean by "replace them". Most likely your problem is a bad
throttle body.
Chevy Cobalt cylinder head and valves damaged causing rough idle and codes.
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2007 Chevy Cobalt Misfire At Idle And Lean Codes