as the topic says. i notice while cruising i get this occational drop in power its only a short drop and picks back up strait away. so i pulled over and slowly moved the revs up while in Nutural... just after 1500 revs and to about 2500rpm i get this vibration through the car... if i hold it there i occationally get a a big drop in revs like a engine cut.... and ideas whats causing this?
1990 LS400
150000kms
Sock standard