Check Engine Light On problems of the 2008 Buick Lacrosse

I have more then one issue. First important issue. While driving down a state road with a peed limit of 50 at 50 mph. My car lost power check engine light came on and the warning light says engine reduced power all acceleration was lost was able to drive at about 30 and was close to a repair shop so got ther they diagnosed a throttle seal. Fixed and repaired December 30, 2016. 6/14/2017 while driving at 35 mph the same thing happened again. I have returned to the shop and discussed with gm service center they say no special notice about this issue but I see numerous complaints about the same issue in forums on line. Issue 2. The lights on the dash speed, warning info, radio light dim for no reason. Issue 3 door locks do not work from key fob or inside car have to work manually the passenger side air bag turns off even when some one in the seat. I have had this repaired once but continues to to this.

While driving approximately 25-30 mph the engine died, steering failed; I was able to come to a safe stop. The vehicle would not start. It had to be towed. Later found out the ignition coil was cracked (part # 10472401) , ignition control module replaced (part # 19245558) & 15a fuse were replaced. I had been experiencing a gasoline smell in the vehicle for months. I had it into a gm dealer 3 times for the issue without resolution. I was told by the repair station that they were amazed the check engine light had not come on before the failure. Apparently the vehicle was only firing on 4 cylinders.