Toyota Repair Problems? Ask a Mechanic for Answers ASAP
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The fuel pressure needs to be tested with a gauge first on a cold engine, then when it is acting up. It's possible,that the armature is getting hot causing less fuel flow.
You can get a gauge from most parts stores for just a deposit.
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You're right,O2 sensors won't cause that.It sounds like they're guessing. You may want to try a better shop to diagnose this.
It sounds like it's going into limp mode.