I have a 06 2.2 cobalt with cps code. changed plugs twice coil pack 3 times as well the ignition module. What else can it be? I am lately getting the fuel trim code also. changed injectors and fuel pressure is at 75psi. Any ideas?

 

fuel pressure is at 75psi? thats a problem. your fuel pressure should be 58psi (give or take a couple) at the rail at all times. if its 75psi you might have a restricted fuel filter or the regulator in the fuel tank is stuck.

whats the code for the cps?

 

341 if I remember correctly. Book calls for 70psi