whats been done to the car so far? heres some video to help in your diagnostic. the car hesitate when accelerating?C8-)
what was the fuel pressure? start with the power balance test.
Anytime I have a misfire I start with a power balance test to see if I can isolate a particular cylinder(s) that might be at fault, once you nail that down the next step is to figure out what the issue is, spark, fuel, or engine mechanical. Here’s a link you might find helpful. http://www.youtube.com/watch?v=bAOmUjAjNjE