I just finish my FC s4 to s4 swap because the old motor apex seal die, but for some reason it seem to be running pretty rich because i have a turbo II fuel pump install as well during when i was prepping hte new motor, my question is the car is running pretty rich, and it seem to die when i drive a like a pretty long distance and let go the throttle..



my question are:

could my timing be off?

could the turbo II fuel pump be sending too much fuel to the injectors more than i need to?

When and how does it die? After a long drive while at idle? During a long drive while at 60 MPH when you release the gas?

after some distance of driving like a mile and up and i let go the throttle.

Does it ever die at idle? Or are there any other times it dies when you quick close the throttle?