Q&A

get a new mechanic. you need to start with basics. compression, fuel pressure, spark and its control. cat converter being clogged. these are basics before talking anything let alone a computer.

Roy

Check the vacuum port side of the fuel pressure regulator. It might be dumping fuel into plenum

Roy and Rick are right! Has there been a check engine light on? Even if there is not it would be worth looking at key engine sensor data and fuel trim figures on a profession grade scan tool to see if anything is a miss. If your mechanic is stumped, 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.