I have been burned many times by trusting what another mechanic did and assumed they didn't miss something. Let alone trust that the owner is relaying the info properly.
If the fuel pump has been replaced then lets assume that this is not the issue. However, that still does not mean that we don't have a fuel pressure issue. The only way to know is to check it.
At that point if the fuel side is okay then that leaves the air intake side. This includes the throttle bore, and sensors. Can you monitor the mass air flow sensor operation or MAP?
Have you checked for vacuum leaks?
There are a number of things that will cause this and we need to start eliminating them and the only way to do that is start testing them. Let me know what you find and we can go from there. Thanks
Saturday, March 21st, 2020 AT 6:38 AM