Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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If the replacement pump is putting out to much pressure this can cause the injectors to allow to much fuel in when they open to atomize and causes this fault here.I find this as an issue in some cases with after market fuel pumps installed.
I would have the fuel pressure re tested to see if this is the case.Your pressure needs to be between 55 and 62 psi.Any higher then this is an issue.
Other then this try removing and cleaning the mass air flow sensor.This sensor is inline with the air inlet from the engine air filter.You can buy mass air flow sensor cleaner from a local parts store and remove this sensor and use this cleaner to spray off the sensor to clean it.The sensor can sometimes start to read incorrectly and causes this issue here as well.
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