DODGY GARAGE | Pajero Gen 2 lifter tick update 3.5ltr 6G74 DOHC

How do you fix problem?

Hi, need some advice if you guys would and greatly appreciated in advance.

6G74 AT, when I put in D and hold the foot brake it pulses/vibrate very very subtly. Not all the time but like light jitter-normal-normal-light jitter-light jitter-nornal-nornal-normal and so on... What do you guys think it is?

Additional info:
Flushed the AT oil (not the filter tho yet), changed one of the black pin ignition coil, new spark plugs all six, cleaned throttle body, mountings are ok.

I did had the timing belt recently changed as well.

On some occasion when I hit the gas aggressively it kinda like hesitant, but once it cleared out it runs like a dream.

I'll put a litre of diesel in the engine and idle it for 10 min before the next oil change it usually helps to flush sludge out of the oil 0passages.

I think I have the same problem 😕