If there is anyone else having this problem, this link may be of use although currently there is no resolution to the issue http://www.toyotanation.com/forum/103-3rd-4th-generation-1992-1996-1997-2001/398978-stuttering-shaking-1993-camry-2.html#post5616513
1991 Toyota Camry Question: Stuttering between 40-50mph and off the line too now on 1991 Toyota Camry
by questar in Nyack, NY on September 11, 2013
ANSWER by csubak30 , September 11, 2013
Cleaning the MAF sensor does not mean it is working properly. If it was failing, it needs replaced not cleaned. Also, have a shop check exhaust flow. You may have a partially plugged cat. converter which would cause these symptoms.