1997 Chevrolet Silverado 1500

I GOT THE TRUCK IN 2011 AND WHEN THE TITLE CAME IN THE MAIL IT HAD A NOTE THAT THE TRUCK HAD BEEN A DEALER LEMON LAW BUYBACK. MY PROBLEM NOW IS THE CHECK ENGINE LIGHT IS ON. I CALLED CHEVROLET FOR SOME ASSISTANCE AND WAS TOLD TO HAVE A CHEVROLET DEALER DIAGNOSE THE PROBLEM. THE DEALER WANTED TO REPLACE MOST OF THE CHECK ENGINE RELATED PARTS AND SENSORS AT A COST TO ME OF ABOUT $4000.00. I THINK THAT I AM BEING OVER SOLD. I PAID THE $85.00 AND HAD 2 OTHER TEST AND 2 DIFFERENT DIAGNOSE COST FROM $1500 TO CHANGE INJECTORS. ANOTHER.GM RECALL BUT MILEAGE PROBLEM. CHEVROLET DECLINED ANY HELP. I THINK IF IT WAS A LEMON THERE MUST HAVE HAD A BIG PROBLEM. I WOULD LIKE TO KEEP THE TRUCK IT STILL LOOKS GOOD. ALSO THE WIPERS DON'T WORK AT TIMES THERE WAS A RECALL ON THEM BUT AGE AND MILES MAY BE A PROBLEM. I COULD USE SOME HELP. THANK YOU. *TR