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Thanks for posting
How did this problem start, did it stop running while driving? have you checked for diagnostic trouble codes? Is this the 7A-FE engine?
There should be a check connector under the hood, you can use it to check for codes using a jumper wire, it's a small rectangular box with a cover on it that says diagnostic, let me know if it has this and I can tell you how to check for codes. A common problem on these engines is the ignition coil inside the distributor, check it fro cracks, remove the cap and rotor and the coil cover, check for cracks on top or burned areas where the spark may have leaked to ground. If in doubt just try a new coil.
Good, keep me posted.