Hi all, I have a 2003 Sable gs with the u vin V6 engine. It has been running great till I replaced the idler pulley and water pump. Now when the car is running it is rough and sounds like a timing problem and then it will start idling very fast like it has a air leak. It also makes a popping sound on the left bank side
Here are the trouble codes it is throwing. p0401, p0174. p1131, p1151. p0171.
Have checked all of the vacuum lines and cannot see any bad ones, any ideas. Thanks Mark