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2008 Toyota Sienna starts hard

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If its predictable, meaning you know exactly when it's going to happen, try this. Turn the key on, do not try to start the engine. Wait 3 to 5 seconds. Turn the key off. Repeat three times. On the third time start the engine. If it starts right up every time than I would agree with fuel being the issue.

I am aware of a fuel injector issue on some of these. The symptom wild show up hot so I don't think this applies to your situation.

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I am an owner of a Sienna, I am not certain but I believe the fuel pump will not energize unless the engine is rotating, either by the starter or when the ECU computes an engine load above a certain threshold. I think it operates this way for safety reasons.

I would start by making sure you have a good battery, if your on the original from 2008 its probably due for a replacement.

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