did you get any water under the hood? if you did, could be the spark plugs grounding out (water down in the plug galley).
if its a real issue, it will come back once the ECU runs for a couple miles or so. sounds like it went into limp mode if its not a issue thats a result of your underhood extravaganza.
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-Thomas-

1998 Eclipse GST Spyder - 14b turbo | 3" Catback | Evo8 BoV | 170fwhp if that
2003 Redfire Cobra - 448whp/435wtq - Sold