Asked in Toyota SR5
What causes my 1985 Toyota sr5 22r engine to race up and down at a idle?
The racing up and down at idle is call enging loping, usually caused by a vacuum leak. It could also be caused by a sticking choke at the carb. Whatever the case may be, you will need to start by hooking up a smoke machine to find the source of the leak. Also check your coolant level.
my 1991 Toyota 4x4 22re had the same race up and down idle. it was a low coolant level.