Check Engine Light On problems of the 1997 Hyundai Sonata

Check engine light stays on after dealerships tried to fix muliple times. I have spend about 3,000 dallors of my money to fix the car. The dealership has finally told me that they do not know what is wrong with the car. The car wants to stall at a stop and the idle jumps aroud while driving down the road. The car really acts up when you have the a/c on.

Fuel tank has developed cracks and a fuel smell is present. 1) in Dec 2000 and Mar 2001 fuel tank replaced because of cracks on top of fuel tank; 2) in April 2001 service for recall 00v314001 was performed; 3) in October 2001 fuel was leaking from a seal between fuel tank and a pipe, leading to engine, resulting in fuel tank being replaced for fourth time and 4) in November 2001 fuel smell was present again and dealership was diagnosing the problem. The fuel gauge operation stays on full then drops drastically due to fuel sender/pump failure. The dealer replaced the gas tank cap. The check engine light comes on due to purge valve failure. Consumer was asking for reimbursement.