Had some time to look more in to it..
Had a bad vvt valve...
No fault codes.
Put when driving and accelerating i had no movement on the cam regulation..
Changed the valve and the idle is now perfect and also the spark timing..

Voltage at battery, in the tester showing the same..
New battery, all negative connections cleaned and checked...
Its almost as something is turning of and on, pulling amps..
But everything is turned of..

Not any codes.
All data looking good except the voltage pending up and down and the same thing with ignition timing.

First, i am from Denmark so perhaps some words come out wrong. I have some problems with my volvo 2.4t from 2000. Idle is rolling from 750 to 850. Voltage in idle is jumping up and down even with the alternator disconnectet. The sparkplug timing is jumping up and down from 30btdc to 0 btdc. The prob...