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Question
i have a 1976 cadillac eldorado. yesterday my carran out of gas in my drive way. so i went to the gas station and got a gallon of gas. then i went to the gas and put my gas in the car. after that the car started to idle high for some strange reason. the car never did this before. i drove the car today and when i made a complete stop at a stop and let go of the brake the car would speed up on its own. i didnt have my foot on the gas pedal. then when i went to park the car it hesitating to move. when i got into my parking spot the car just shut off on me and when i put the car in reverse it shut off to. what is causing this problem

Answer
Hello,That is a tough one to diagnose without being at the car.
I can only guess which I do not like doing.
Possibly you sucked up rust or some type of residue from running the tank dry. It may have placed debris in the in line filter which is not much of a filter on this style vehicle. This type of filter located in front of the carb will bypass somewhat and let the debris go ito the carb, causing you a real headache. For this reason, back in the 70s  we would drop the fuel tank, have it boiled out. We would disconnect the fuel line at the filter going into the carb. Blow compressed air through it. Then the filter would e removed and the carb was removed and rebuilt. I went through this many times over the years at the dealers. This is an opd car and it is very possible there is rust at the bottom of the inside of the tank. Very common. The sock in the tank should be changed as well.
The symptoms you describe could very well relate my thoughts here. Try changing the inline filter first and see what happens.
Good luck!

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Rob Painter

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Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?

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Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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