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I have a 2001 5.7 gsi dp.

Problem - After idle, I can only increase RPMs in increments of 1000 until I achieve full throttle.

How I achieve full throttle is by starting and stopping and at each start and stop, it increases RPM by approximately 1000.
Once I have achieved full throttle, it runs fine until I go back to idle in no wake zones.

It sat for 2 1/2 years. The fuel was treated. I flushed fuel, replaced fuel filters twice, have run approximately 5 fuel tanks through the system. It seemed to be getting better and now worse.

Any help of suggestions greatly appreciated.

Sounds like the excelerater pump In the carb had the same problem a few years ago replaced the diaphragm and she was all good

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2012 h200ss

Thanks for the feedback - found out today that the high pressure fuel pump failing when we put load on it.
It dropped down to 5 psi - should be at 30 and is making lots of noise.