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You will want to check the fuel pressure and flow to see if either one are too low.
Ignition ON Engine OFF40.5 to 47.0 psi
With Regulator Vacuum Applied 3.0 - 10.0 psi Less than Ignition ON Engine OFF
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.
If they are both ok, then you will want to take a sample of the fuel to be sure that it’s not contaminated.
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