Base ignition timing should be 10 degrees BTDC not 15. That is base igniton timing, the ECU will provide an electronic advance and, under boost, you do not want more than stock advance.
You definatly messed something up when you "washed" the engine bay. Did you use a power washer, or what?
You probably sprayed the coil packs or the MAF or the igniter and fubar'd it. Time to start testing with a multimeter, do you own a TSRM? If not, there is a link in the sticky's in this forum.
You are never suppost to wash the engine with anything. You want a clean engine? Take it apart and rebuild it, cleaning the parts as you take them off. Looks like you learned the hard way. Sorry.
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