Exh warning light '82 spider

[Loosej@domain.elided]

Alfisti, 
  The Exhaust warning light in my son's '82 Spider has come on. The only
mention of it that he can find in the owner's manual is that the Exh light
means Exh warning.   Can anyone offer a better explanation?
  
Thanks,
joel lewis
houston
'74gtv
'89 milano

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