Please, may I differ?
I would not, first, try mixture control ...etc.
I would, instead, first FLY THE AIRCRAFT (as ChickenHouse's log shows)
Capital letters because the pilot (me) is now worried/ concerned/ scared/ frightened/ startled; not one of these improves pilot performance (certainly not mine).
This, now, low grade pilot needs the simplest possible advice at the forefront of his/her brain.
It is only after the flying is well sorted - trim is vital here - that I would turn to the rest of the stuff that ChickenHouse & atceng list.
In training, should a PFL be needed, I chant to myself "speed, speed, speed ...."