car has been setting for awhiletrying to get it runing

Cavalier has 122 K miles on it. Well maintained. While trying to start the car after replacing rear fuel lines, the mechanic said fuel gage failed to tell him there was no fuel in the car. (I could have sworn there was at least 1/8 tank of gas when I brought it into the shop.) He says sensor is faulty.

After 1/2 tank of gas was put in the car, a second opinion mechanic says that (via computer measurement analysis) the sensor is working correctly.

The car is running very weak. It feels like if I don't keep my foot on the gas,it will immediately slow down. At first I thought it might be gear,but no since it can get to 60mph,but feels like it's straining.
The check engine light went on and has been on for a while now. At first I thought it was fluids but all checked out fine and no leaks.
I just failed inspection at motor vehicles and they took the time to show me the codes that showed up. They were P0404 and P0405 which is telling me (from this site) the EGR Valve Position Sensor or Valve may be to blame.
I'm wondering if I should just replace both the sensor and the valve? Would this be an easy enough job to do?

Replaced complete compreoor, checked hvac diodes, wiring

Standard transmission, will the shift solenoid be in the floor console like the automatic trans are? I believe it is wires that are broken as I have read on here that there are a lot of problems with this.

It happens every time i turn on the car. Sometimes a service car light will come on.

on the highway ac and car temp gauge ok but stop traffic ac gets warm and the temp gauge starts climbing radiater fluid ok and oil not milky noticed fan not working by radiater would this cause car to get hot and ac throwing hot air in traffic

My car shakes when I'm stopped. Someone told me it was because the spark plugs.

there is some coolant in there but I don't know if I overfill it, will that do damage? And, what marking do I fill it to if that matters?

To operate A/C ,select the face vent only,But all vents is open same time. Took all Dash cover apart.Got switch control for 5 vents selection,Put another switch, still doing same things. There vacuum hoses connect to all selection,Is there other parts control vacuum regulator ,sound like vacuum problem?

I took my car to auto zone and they told me that it means i need to check the speed sensor circuit and that it has low voltage but where would i fine this and is this a easy fix? I have tried Googling everything about this car we just fix the Evap emissions leak. Right now my car idols really high at 1600 then some times it goes up to 2000 when stopped. Some one please help me

When the speakers were put in, only the wires connecting to the speaker were replaced, and since then my windsheild wipers dont work. Noticed it the other night, shut the car off and turned it back on and they worked again.was down pouring earlier today and still worked, then they stopped in the middle of my windsheild and havent worked since. Check my fuse and it was fine, if anyone has any answers or suggestions that would be awesome.

Just bought this cavalier for my son. The steering wheel feels loose, it can wiggle side to side, like when you are turning, a good bit before it meets resistance and turns the car. When going at a good rate of speed it is difficult to control in a turn. This is so hard to explain. I'm sorry. If anyone has any idea what is wrong and about how much to repair I would be very grateful:

Thank you,

also towing cost and have new fuel filter already bought 46260 area

the rubber gasket around the insert that is supposed to hold the MAP sensor tight is old and worn out. if that is causing a vacuum leak would a leak in that location cause the engine to backfire and lose power when i accelerate? it also idles rough and wants to die when I am in gear and stopped.

DTC says vss, and O2 reading rich,all known sensors,fuel injector,relays,fuel pump,fuel filter,vacume hoses,electronic firing modual mounted under coil pal replaced,new rebuilt ECM from O'rileys but had to use main control chip out of old ECM.when problem first appeared DTC codes were bad computer and vss,with the injector dripping fuel in,now has fine cone shaped spray pattern; but only runs smooth if throttle is floored for higher speeds,you can see cloud of smoke blow out exhaust momentarily till I let up on throttle

Codes u1301, u1040,u1064,p1626