Carburetor fuel and air screw settings for 1988 Toyota corolla

already fixed

for the Asin 2bbl try from closed position (close gently) open approx.
1-1/2 to 1-3/4 as a starting point. Then with a tachometer hooked up slowly and carefully adjust in either direction to obtain highest RPM.

I’m happy to assist further over the phone at https://www.6ya.com/expert/howard_977676954994c5b2

BOY,that sounds like the EGR is too far open!Un plug it and see.
Maybe getting the wrong signal from the '88 computer.

Also my be a fuel delivery malfunction.
Fuel pump,filter,fuel pressure regulator.

I need to ask more questions,here.

The fuel sensor should be in the fuel manifold and not it is not necessary for the fuel filter to be full as the fuel in equals fuel out and unless you can invert the filter, the air is of no consequence.

If this is the model with the variable venturi, it has a little green vacum box claped under the air filter box, theyplay up a lot, results in bad starting, bad idle, or stalling.

Hope this helps

Problem is carb. Rebuild or adjust properly. If it has anti-dieseling solenoid, make sure it's working.

IF YOU HAVE CARBURETOR. IDLE SPEED TOO HIGH NEED ADJUSTING. CHECK ACCELERATOR LINKAGE OR CABLE COULD BE IN A BIND CAUSING HIGH IDLE SPEED.MAKE SURE THE ACCELERATOR PEDAL FLOOR MAT NOT IN THE WAY.CHECK CARBURETOR MOUNTING BOLTS.RETIGHTEN TO MAKE YOU DONT HAVE A VACUUM LEAK BETWEEN CARBURETOR GASKET AND INTAKE MANIFOLD THAT WILL CAUSE HIGH IDLE SPEED.IF YOU HAVE FUEL INJECTION ENGINE LET A GARAGE SET THE TIMING AND IDLE.

Quick explanation of your fuel system:

An automotive fuel system consists of everything between the fuel tank and the carburetor or fuel injection unit. This includes the tank itself, all the lines, one or more fuel filters, a fuel pump (mechanical, electric, or both), and the carburetor or fuel injection unit.
With the exception of the carburetor or fuel injection unit, the fuel system is quite simple in operation. Fuel is drawn or pumped from the tank through the fuel line by the fuel pump, which forces it through the fuel filter, and from there to the carburetor/injection unit where it is distributed to the cylinders.

So with that info...try first to clean your spark plugs.
Next, replace your fuel filter.
After that, depending on a carburetor/fuel injection, try an additive that cleans the injectors. For the carburetor, try a half of can of what is called "Seafoam". It comes in a metal can available everywhere, including Walmart. It is worth the $6-8 and also will "dry" out your fuel from water. Very good product.

After that, get back to us and let us know how your Toyota is running.

Because it's carbeurated they have an electric 'idle up' solinoid (or vacuume) to compensate for rev loss when load is put on the engine caused by the alternator working harder because your using power. It should have a small adjustment screw on the carbeurator to lower the revs. If you have it set too low it will shudder when in drive & foot on brake with headlights on. It should only pick up about 200rpm when lights are on. To find the screw, take the air filter off, run the engine & look for something moving when the lights are turned on & off. Somewhere near the moving bit you will find the adjustment screw. I hope. I'm not sure exactly where it is on that model.

lower your carburetor gas screw adjuster, there must be 1part gas and 5 parts air.