So my tbi 350 was running a bit lean and has been having a little missfire here and there so I decided to try the vortec pump and it ran rich with the vortec pump which makes me think my fuel pressure regulator has **** the bed. What’s y’all’s thoughts. I put a new stock Delphi pump back in it and it’s running better but still seems a little off. I’m thinking the regulator has gone bad since it ran lean with the stock pump and rich with the vortec pump. Any thoughts?