Hi, i recently changed my water pump on my b5 2.4 v6. after the job was completed I started the car and let it warm up. I then switched it off and restarted a few times. no problem. the next morning I started the car and started to reverse when the car stalled and now will not start. It seem to be flooded. I now swings but sounds as if the ignition timing is right out. (poping coming from exhaust) I have checked for spark which is good and the injectors are delivering fuel. I even check to see if the valve timing has moved, I removed the tappet cover and checked that both banks marks line up on the camshaft chain marks and notches on the sprocket with the crankshaft on the mark. it seems as the "ignition timing is out. what could cause this. Please help