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I am not a Cady expert. In my experience, you can probably run an engine with out the air pump ... but why would you? The air pump reduces emmissions and improves performance. Removing the pump will also require reconfiguring the belt scheme.
It sounds like the idle compensation circuit for the engine is dirty or faulty. Have your car checked at a shop. have them check the idle air motor for dirt or malfunction. It could be that it only needs to be cleaned or replaced.
The compensation circuit adjusts the idle/slow speed of the engine. The air conditioner puts a load on the engine and this circuit adjusts the engine speed to compensate. Also, when the car is cold this circuit adjusts the idle speed to prevent stalling and help the engine warm up faster. I hope this information helps you.
i have a 1989 cadillac deville 2 door front wheel drive i just changed the fuel filter in it and i pour fuel injection cleaner in the gas tank. when i pour gas in the carberator it gives a little start to the car and it started the car but it wont stay on. i just bought a new battery for it but i havent tried it out yet just because the positive wire going to the battery was bad so i cut the wire and gonna put a new wire for it do you have any suggestions what is wrong with it. it has been sitting for a couple years.......and it does start it just turns over......