Lacks power
Good at start up then lack power under load,a plugged exhaust can do that.If there was a misfire that has been ignored the catalytic can only handle for so long. The 1994 Previa uses a vane airflow meter.so a torn intake duct can also cause lack of power under load,so check the air duct at the MAF to the intake and inspect for false air.
what size engine is in your car? if its a v6 you should check the condition of your coolant, if it is contaminated with oil then there is a good chance that your lower intake manifold gaskets are leaking.
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