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Does it seem to act as if the fuel pressure is dropping? (like a surge)
Are there any trouble codes or engine light on?
Yes, the fuel pressure could very well be dropping.
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You will want to check the fuel pressure to see if it is too low. Also that the filter is not restricting the flow of fuel.
Then if the fuel pressure and flow are good, the exhaust may be a little bit restricted. You can have a back pressure test done on it at most exhaust shops to see if the cat is clogged.
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