Originally Posted by JamesDean

Well that harness looks lovely. Is that the main engine harness? It looks like you'll need to buy a new harness. They're about $750. The 93-95 era cars I think had insulation issues hence your mess of tape and god only knows what else. That should be the first move to replace the harness. If you get me your vin number I can get you a part number for the harness. I think there were two different ones based on serial number. All of those errors could be coming from the bad harness.

Window Regulator - if the window has trouble going up/down as in shakes, gets stuck, jiggles, either the regulator is loose or broken. You'll have to take off the door panel and check it out.

Seats - I've no idea.

Gas - You'd notice a puddle or a spot on the driveway or under the car. Place some clean cardboard under the trunk and under the engine bay. Perhaps your fuel level sender is wonky and needs replaced/cleaned

The fact the car is using a lot of gas might be related to the bad wiring harness. The poor engine control unit is just spinning around in circles confused as ****.

I think thats first order of business--replace the harness.