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1999 sunfire starter problems? - auto starter problems

I have a 1999 Sunfire with a 2.2L engine. I started recently in the last 6 months by problems with the car to have. The launch has been replaced by a new and twice I've been to many workshops that can not understand what is wrong with the car. Sometimes when I try to start it is a crunch and you do not start strong. Another time, when I hear the fuel pump, but try to calm the machine, a mechanic told me a screwdriver to start the solonoids or starter then. Most of the time you start the car, but I need the gas pump and a few seconds, then starts with a noise screetching highpitched. The start relay has been replaced because it is not a memory of it the relay or the starter. No idea what could be the problem? Any help is greatly appreciated!