I have a Chevrolet venture 2000. around town the vehicle drives fine but after we have driven on the hiway for along drive (about 75 or so miles) the car starts hesitating and slowing down. if I coast for abit it will take off again as long as i dont push it. I have put in fuel injector cleaner and this seems to help. Back in town it runs fine again until we try to go out on hiway again. Fuel pressure is about 50 psi books says should be between 52 to 59. codes are saying that oxygen sensors have low voltage PO131 and 137. changed fuel filter and air filter and also plugs. still no change. now in town on hard accelaration it will hesitate. changed fuel pressure regulator and still about 50 psi. I need some help with this. Thanks for your help!!!
May 17, 2008 at 3:21 PM