NHTSA Complaint #10350823 — 2007 LEXUS IS 250

I HAVE AN IS 250 LEXUS, 2007. I PURCHASED THE CAR ON OCTOBER OF 2006. SINCE MY PURCHASE, THE CAR JUMPED BACK AND FORWARDS WHEN THE AIR CONDITIONER WAS STARTED AND SOMETIMES IT SHAKE WHEN I STOPPED ON A RED LIGHT OR A STOP SIGNAL. I HAVE COMPLAINED ABOUT THIS ISSUE MANY TIMES BUT THE DEALER SAID THAT THE COMPUTER DO NOT DETECTS THE PROBLEM. LAST MONTH (JULY 22, 2010), I WAS DRIVING MY CAR ON THE HIGHWAY AND IT UNEXPECTEDLY DECELERATES AND BEGAN TO SHAKE. I WAS UNABLE TO DRIVE FASTER THAN CERTAIN MILES. ALSO, THE VSC LIGHT CAME ON. MY CAR HAS BEEN IN THE DEALER FOR A MONTH RIGHT NOW AND THEY DO NOT HAVE A FINAL AND CONCLUSIVE DIAGNOSIS OF WHAT CAUSED THE INCIDENT AND HOW TO FIX IT. FURTHER, I KNOW OTHER PERSONS WHO THIS PROBLEM WAS OCCURRED TWICE, SO I EXPECT IT TO OCCUR AGAIN. MOMENTARILY, THEY INDICATED THAT THE PROBLEM WAS CAUSED BECAUSE OF AN ACCUMULATION OF COAL IN THE VALVES BUT THEY ARE STILL MAKING TESTS TO THE CAR. THE PEOPLE FROM TOYOTA HAVE NOT BEEN AVAILABLE TO SPEAK WITH ME ALTHOUGH I HAVE REQUESTED SO, AND I HAVE MET IN MANY OCCASIONS WITH DEALER'S REPRESENTATIVES (THEY HAVE INDICATED THAT THEY DO NOT HAVE TO SPEAK WITH ME). I UNDERSTAND THAT THE FACT THAT THE VEHICLE UNEXPECTEDLY DECELERATES WHILE IN THE HIGHWAY IS A MAJOR SAFETY PROBLEM THAT SHOULD BE TAKEN CARE OF BY TOYOTA. I MAY HAVE CAUSED AN ACCIDENT BECAUSE OF THE UNEXPECTED SPEED PROBLEM. THIS CAR IS NOT SAFETY AND SOMETHING MUST BE DONE. MOREOVER, WHEN TOYOTA IS HIDING IT'S RESPONSIBILITY. *TR