I have 1993 Toyota pickup 22re 5spd ever once and a while when you step On the gas the rpms drop then go up and down and it acts like it isn't getting gas. Doesnt die sometimes the check engine lite comes on. Only last around 30 sec. Then runs fine. I have replaced fuel filter checked PVC

SOURCE: 1985 toyota 4x4 22re missing and rough idle

Have you pulled out the spark plugs to see if there are any tell tale signs on them.They are a good indicator of many problems that occur and can save a lot of time isolating the problem.They should all be the same colour.Is the air box and lid properly secured with no leaks or splits in the intake tube.Have you put injector cleaner in the fuel tank to clear up any possible dirty injectors.Therse a few things your problem could be including engine vacuum leak which you can find by lightly spraying carburettor cleaner around suspect places such as inlet manifold and around injector seals.

SOURCE: 1993 Toyota Camry can be running fine when you come to stop dies.

I would think that it is one of two common problems...

1) The Idle Air Control (I.A.C.) valve may be bad.

2) The Exhaust Gas Recirculation (E.G.R.) valve may be stuck open.

You may need a skilled technician to determine which of the two possibilities is the problem.

SOURCE: 1989 toyota 22re pickup lopes at idle and

Its possible you have a faulty EGR valve or PCV valve.

SOURCE: 1995 toyota pickup, surging at around 2000 rpms

Is the check engine light on?

A major cause of surging is either air leaks between the air flow meter and the engine intake manifold, or a bad or mis-adjusted throttle position sensor.

SOURCE: when it is warm my 1994 toyota pick up with 22re

the idle air control valve on the throttle body.