I noticed that when my compressor for the AC or i have the defroster on that the RPMs with surge up for about a second then go back down, does it at idle and when driving i can feel it and watch the RPM gauge go up about 400 RPMs then back down about every 20 seconds maybe and you can feel the compressor kick on when it does it, anyone else have this problem and fixed it? its really starting to bug me

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05 CRD Limited, SEGR Kit, EHM, Selectrack Alpine DVD, 6000k HID headlights, Aux Lift Pump, 2.5" straight pipe, Diablo Extreme Puck, Euro converter
02 SLT Cummins H.O. 6spd manual with southbend 3850dd, fass 150hd, ddp 150hp injectors, arp studs, adrenaline stacked w smarty, traction bars, 6 inch stacks, level kit, bhaf

A little fluctuation is normal, check for all the possible loss of power problems like dirty MAP sensor, dirty air filter, fuel air leak, bad battery putting a load on the alternator, or bad EGR. Any of these little problems will cause the engine speed to go up and down more.
Good Luck.

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2006 Pearl Green CRD
Magnaflow 2 1/2" Cat Back
KJ Extra Leg Room Brackets, Carter Lift Pump, V6 Airbox, ORM
Fuel cooler, Oil Separator, Progard 7
Gauges EGT Boost Trans Temp Oil Pres, Michelin LXT AT2 245 70 R16
7,000# Draw Tight hitch, PML EX Deep Trans Pan
Centrifuge, SunCoast, Transgo, RAM TCM, InMotion Stage 2
Wife's 99 TDI VW Beetle

Would the EGR still cause a problem if I have MAFS unplugged? I clean the map sensor every oil change which I just did a couple weeks ago, and I have auxillary lift pump so shouldn't be any air fuel.

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05 CRD Limited, SEGR Kit, EHM, Selectrack Alpine DVD, 6000k HID headlights, Aux Lift Pump, 2.5" straight pipe, Diablo Extreme Puck, Euro converter
02 SLT Cummins H.O. 6spd manual with southbend 3850dd, fass 150hd, ddp 150hp injectors, arp studs, adrenaline stacked w smarty, traction bars, 6 inch stacks, level kit, bhaf

It's the ac kicking in and out. It does it when you have defrost or feet selected.

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2006 Sport CRD
Provent-removed, Snorkel Air box, Raycor fuel head/filter,Omega temp. sensor, Fuel pressure gage, Kennedy Lift pump-not working now, fuel cooler Covered, B&M cooler for trans oil, Suncoast TC/ shift kit, 245/70/16 Firestone Destination A/T's, Amzoil& water in the diffs, mobile 1 0w-40, Radiator blanket
Thanks LOST