P7100 vibration through pedal at 1000 -1200 rpm

[P-710024V]

Well my problem is just as title says, P7100 vibration through pedal at 1000 -1200 rpm. At idle in neutral, in gear with clutch in, cruising speed off the throttle so engine is at idle. I can feel the vibration when I touch the IP lines and when I touch the main fuel line to the IP I also feel the vibration there too, and while in cab I feel it through the throttle pedal. It's a 2000 24 valve p pumped motor. What the heck is going on and has anyone had these symptoms? Just ask if I haven't given enough info. Thanks

 

[P-710024V]

Oh yeah it has a glacier diesel mechanical lift pump and a tork tek 60psi OFV

 

[joefarmer]

What return springs are on the pump?

What governor springs?

Is the vibration a lope (meaning RPM changes without changing throttle)?

Newly rebuilt engine?

New ppump conversion?

What changed recently that you noticed it?

 

[12v_gal]

Depending what GOV springs are in it it may be just unbalanced (the p7100) and the vibration is from the lope as the previous guy said.