chommp

I just bought my 94 sc400 and i had the same problem, what had happened was whoever had the car before myself, put regular fuel instead of premium in it, so they had to flush out the fuel injectors, replace them, and fill em up with premium and let it run for a second, after that was finished, its run smoothly ever since, might want to check it out and see This is a comon problem wiht the sc400 its your fuel ECU located on the driversice rear panel "Under the rear side window" There is a paperclip method (jumper 2 points in the engine compartment diagnostic port) to test this there should be a post sowhere in here with more details... but I can say with a 99% confidence the FUEL ECU is the problem..