You may need to double check that you replaced all vacuum lines, which may have been removed. You can always visit your local auto parts store, where they may be able to hook a trouble code reader for free. This may give you more of an idea, also if the air filter/breather box was removed you may need to check if there is a sensor that was not replaced there too!
Hope this Helps!!
A. J. Valle
〉 Answered on May 7th, 2012 by Amanda J. Pierce, MBA "AJ", Certified Mechanic, Project Coordinator; Primavera Scheduler at VIGOR Alaska Industrial Shipyard & BizzM3ch Solutions