diesel lag?
 

i have a 2001 ford f250 with edge with juice and a custom air intake with a 5 inch exust. when i step on it the truck will get going then have a a second or 2 second lag and it will start to red line why is that?:argh:

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i think it may be a transmission thing but not sure

Hard to say, when you say redlines, do you mean it free rev's to the red line or just runs up to the red line?

it goes up and into past 4000 rpm i dont let it get past that i let off when it gets into the red