Q&A

It's not too complex to test the crankshaft, camshaft and other key engine sensors using a good scan tool and or an oscilloscope, and good volt/ohm meter. Testing all the inputs and then test out puts from the computer. Hyundai as a car manufacturer put a lot of free technical information and workshop manuals on line for Hyundai owners. Check out www.hmaservice.com lots of great information.
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. 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.
There are companies that you can send your computer out to and they can test it, the company I use is Fuel Injection Corporation
2407 Research Drive
Livermore, CA 94550-3851, United States
(925) 371-6551

you need a new mechainc. a code number never identifies an bad part, just a failed system. you need someone who can accurately identify the failure for you and give you a bid.
was the timing belt checked??

Roy