I've got a 1986 cad-deville the motor run great at idle have change ICS done on 1990 Cadillac DeVille

done plugs/rot/wir/cap/fuelfilter/all vac hoses, when I get to about 60-65 mph I get a lite miss and stall when giving it gas and hold it steady gets worse as time go's on vacum readings are good at idel and mid range?? Can you please help me thank you for your time in this matter..when comp-resets i'll get some codes if i get reply

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