Corolla 90 motor failure

Good, about two months ago I bought a 1990 Toyota Corolla and I have a problem in the engine, it is stable in minimal but when making the exit does not raise! As if the obstructed gas filter were, I already changed the filter, clean injectors, check spark plugs and their cables and I no longer know what else to do.
I would appreciate the help.

Check that the spark is strong and blue if not the problem is the coil

You could check the progress degrees
the Toyota Corolla from 87 to 92 Motor Code 4A-F, they carry 10º If you give me the motor code I can give you more data.