I'm getting the following Error codes on my 93 deville and wondering what they indicate the actual problem is:

e27
e40
e98

f48

i know f48 is the refrigerant system, not too worried about it right now. e27 is an open throttle switch circuit, e40 is fuel pump pressure switch, and e98 is High RPM P/N to D/R in ISC Range

my question is what exactly do these mean that i need to check out?

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