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 on 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.