MY 1990 LS400 WONT LET ME SHIFT GEARS WHEN I STEP ON THE BRAKE AND MY BRAKE LIGHTS DONT TURN ON. BUT WHEN MY BRAKE LIGHTS WORK I CAN SHIFT GEARS.WHAT CAN I DO TO FIX THIS WHAT DO I GOT TO SPEND I DONT WANT TO TAKE IT TO A SHOP I WANT TO KNOW IF I CAN FIX IT MYSELF THANX 2 ANY AND ALL THAT REPLY