Cadillac DeVille Questions

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how do I check voltage to the board? I assume the 4 heavier wires on the left side of the board are input. which wire is power in. any other suggestions?
Leak has been fixed before with something that cost around $ 60-65. Drove it for a long time even a couple 4 hour road trips then went out. Again. Each time seems to get worse. Had towed in but haven't heard verd...
Code po174
Car just stopped pulling when i put it in gear i get nothing
Dies when coming to a stop now won't start at all.
car drives very rough
Back windows the same door locks dont work on passenger side cant set the clock it all was good till the battery went dead
I can't find my fuel filter on my 91 deville