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Ok guys 2000 rd688s e7 400 8speed fuller 

I can hold the pedal to the floor in every gear it will reach the top end and the boost drops even in 8th gear 

Where should I start cause I can't remember the truck doing that before 

I have a  driver in it so it's been a while since I drove it..

It does feel like it pulls like it use to when I did drive

Check airflilter it's good but going to replace it tomorrow anyway 

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Not a very clear description of the boost drop. You probably have clogged fuel filters. They typically act like a governor slowly lowering the RPM that the boost cuts out at.

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It'll pull fine til it hits a point where the engine is consuming more fuel than can pass through the filters. 

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Posted (edited)

Again ! Is the guy driving in the power band 1400-1700 is an example!1200 -1850?Most engines have a sweet spot!

Edited by fjh

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At a certain point of rpm ,maybe 1700 the governor starts to the rack back on fuel cutting its out put and then the boost will drop as the rpm goes higher.Sounds like its working like should be.

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