Question about 1988 Ford Crown Victoria

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Surge , 10 mpg, rich exhaust,

Runs lousy, have replaced all the temp. sensors,injectors,map,itack, complete tune up, only has 49k but I"m ready to junk it.....doesn't show any codes in computer, have been to four different shops, no vac or fuel leaks.. has black coating around fuel tank cover?? runs lilke its fuel starved when pushed to upper rpm scale////??? helllllllllpppppppppppp

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Check the catalytic converter it may be clogged and will run badly if it is clogged

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