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Some things I've learned from personal experience with my '87 GLE. 1) If your distributor is like mine and is between the cylinder head and the firewall, the internal hall sensor can break loose in higher mileage engines. Pop the hood and take a listen. It will make a similar "buzzing" noise if it comes loose and will kill mileage and make your car run like crap. Easiest fix is to replace the whole distributor assembly (NOT just cap/rotor) yourself if you can. A knowledgable shop can replace either sensor or distributor for you at about the same cost. (What you save in parts, you pay in labor). 2) Check the condition of your wiring under the hood. If the insulation on your wires are cracked/sticky/missing you're open to a whole host of gas eating, performance killing gremlins. Fortunately, should this be the case, you can replace the entire engine wiring harness as one unit. Unfortunately, the harness costs about $550 ITSELF thru a dealership IF you do the install yourself.
Other thoughts: You have 2 fuel pumps. One in tank, one under the car on the drivers side; The damper flap for your a/c system (the part that changes which vents air comes out of) is driven by vacuum from the brake booster I believe. If it doesn't hiss when you move the lever, check for a loose hose under the dash; Your gas tank is 13.5 gal. US.
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