Hi everyone. New to the site and im having problems with my fuel system im guessing. It started on sunday, I was driving along and the car started to shudder while i was doing ~80 mph, I got to my house, turned the car off, went inside for about 20 minutes, then came back out and tried to start the car and it started, but died immediatly after. It did this for about 20 minutes, then i changed the fuel pump relay and it started back up and decieded to run, but it is still shuddering and is running rich. around 10.5-10.9 on my wideband. before this happened it was running around 11.6-12.2. I have been thinking it is spark plugs, a bad injector, or the pump itself is going bad. It also shudders now during WOT and at full boost, 15 psi. It has 60 lb injectors, zzp 3in intake, custom exhaust, and a zzp FMHE. Its a 2005 cobalt ss/sc

 

Moved to problems/service/maintenance.

 

Bump.

 

bump?