Car stumbling - can now datalog

[Black1999Cobra]

My car was stumbling before if I would get on it for a couple of seconds. (Run through first, and at the end of first, the car would fall on its face like it had no fuel. Rev it up a couple times, and everything was back to normal).

Here is a run I did last night. What do the numbers like .5 for the fuel pump duty cycle mean?

Any other ideas on what to datalog and how to read it so that I know my fuel pump is ok?

 

[COBRABRAD]

How old is the fuel filter?

 

[Black1999Cobra]

I had the fuel filter replaced about 1K miles ago (roughly 3 months ago) by ford. Everything ran fine before and after. Car dynoed fine (started running out of fuel on 70 shot) but never stumbled.

 

[COBRABRAD]

The MAF AD count will tell you if it's a MAF issue, the count should be correlated with RPM.