Q&A

first of all, put the cat back on.
you need a trans shop to see if there is any adjustment for the throttle pressure in the trans. if not, then it is internal and most likely will have to be overhauled.

Roy

Hi Roy,
Gil, the SC400 has two distributors at the front of each cylinder head with a separate coil to operate each distributor, it does not use a coil pack. If one coil fails the engine typically will run but run poorly. I'd look at coolant level, coolant temp switch have seen the idle control at the throttle housing fail on some of theses. Roy is right needs cat. convertor on car. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online
There is a professional service called Identafix. http://www.identifix.com/info/about_us.htm They only deal with professional repair shops. They are in the Minnesota 651-633-8007 begin_of_the_skype_highlighting 651-633-8007 end_of_the_skype_highlighting. Your auto repair shop do all their diagnosis tests, and discuss your problem with a team of professional technicians great service cheap and very bright people. If the repair shop that are repairing your car are stumped this is a great service. This company only deal with automotive repair shops and don't answer questions for the general public but are an amazing knowledge base.