I have a 2000 chevy impala. just recently the gas gage has been going nuts- it will just bounce between E and F no matter how much gas I really have. All of my other gages are working. Has anyone else had this problem? Is there any way to fix it besides taking it to a mechanic? Repair costs would be around $300+ and I really can't afford a bill like that right now. Any help would be greatly appreciated.