[amac209]

4.3's have had lots of problems with the egr getting clogged and not closing all the way. try removing it and cleanig out the passages. spraying water on an engine almost always creates problems try unplugging all the electrical connections and blowing them out with compressed air. i had a similar problem with my truck the tps had a hole in it and water totaly destroyed it. could also me a bad spark plug wire i would go ahead and change the wires/plugs& cap& rotor. good luck