What is wrong with my 2000 GMC Jimmy?

Ted

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My jimmy has been giving me trouble starting the last 2 days. And when i do get it to start it still tries to crank itself over even with my hand off the ignition. Even one i shut off the engine and took out the key and was stepping out the car and it started by it self with no key. I'm sure it is an electrical problem of some sort and nothing paranormal but i just want a good opinion as to what the problem is and roughly how much it should cost to fix cause money is tight these days.
no remote starter
 
Sounds like the key switch is probably defective, because you need power from the switch to the ECM and you need power from a different contact on the switch to crank the engine.
 


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