I am losing power after I accelerate fast and go about 90 mph. After I reach this speed and slow down the car barely goes. IF I turn it off and restart it it runs fine has long as I don't go fast again. Any ideas????

 

maybe clogged cats. do you have any rattling noises from under your car? i was thinking maybe your having a chraging issue with your battery or alternator. cars will act funky when they dont get enough electricity to the engine and can make the engine sputter and lack power do to insufficient charge. its just an idea to check into to. usually youll get a battery light though. turn on all your power consumers while driving and see if you get the problem to occur with more load on the charging system.