my 03 cavalier has been running rough especiallly at lower rpm if i give it to much gas it kind of bogs down. My car hasnt thrown a code i checked it with a scanner no pending codes either. So my question is, What is the fuel psi supposed to be at on the ecotec? Mind is at about 55 psi before i start the car and 60 at idle which seems kind of high but then i dont know what the ecotec is supposed to be at. Is there some kind of online servive manual you could look up this information or do i have to dish out the money to buy one. I tested th fuel psi regulator and it seems like its not working i disconnected the vacum line and the fuel psi stayed the same.Thanks alot.