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Engine bay was washed now car idles to rough to be driven

(1990 Cadillac DeVille)
in Chandler, AZ on August 28, 2016
car is getting fuel, spark, air,etc. what could have gotten wet to do this.? Seven different mechanics said they don't know what it is wrong with it.
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on August 28, 2016
it may or may not ever run right again! one guy on here a while back at the car wash in a Jaguar,said i sprayed the engine down real good with it running and it cut off and wont start back,wonder why he said(probably cracked the block)? CAN'T SPRAY THESE ENGINES DOWN,unless a PROFESSIONAL DETAILER does it, or you really know what you're doing,PERIOD! sorry...
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