sense there is no engine light,,we need to check a couple of things here..
1-check the fuel pressure,these must have no less than 60psi at all times..i know you have already replaced the fuel pump,but it is common to get a bad new pump,,so,check the pressure
2-remove and clean the egr valve,sometimes the valve will get dirty with black soot and not close all the way thus causing a major vacuum leak from the exhaust
3-the tps[throttle position sensor] i have seen these tps sensor go bad and not give a code for it
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