I have a problem and its either my injector or my fuel pump or my fuel pressure regulator. When idleing my car seems like it wants to quit but doesn't cut out. Then I put it in gear and does the same for the first couple of seconds then its fine. So what can it be?

 

Where is the fuel pressure regulator at?

 

Sounds like a mis-fire. I highly doubt its a fuel problem... Is the CEL on?

 

What is the CEL?

 

CEL = check engine light

 

if u have recently disconnected the battery or reset your ecu in some other way you will experience the symptoms you've described. if that is the case, once your ecu figures itself out, the rpms will smooth.

i believe you can just leave the keys in the ON position in the ignition but without starting the motor for 15-30 minutes, but hopefully someone can correct me if i'm wrong on this