Re: Washed engine--03P71--problems now--Help!
I would have it hooked up to a reader that can tell you exactly what is wrong with it. Take it to Autozone they have a small OBDII reader and they will hook it up for free. Takes out the guess work.
I would also check all the connections. Electrical and vacuum. Something must have come loose when you hosed off the engine. I have cleaned my
2000 Mustang engine numerous times and never had a problem as you described it. I bet it is something fairly simple.