Alright, my rpm-drop is getting serious.
It's coming now even when driving in the traffic, and just idling.
But very hectic. So here are the symptoms I'm experiencing:

1: Cold engine start: OK, idle: OK and runs OK.
2: Warm engine starts immediately, but RPM drops for a few seconds, then idle flattens, runs OK.
3: Hot engine (over ~90C) hard to start, starts only with full gas pedal, serious RPM drop for a few seconds, then flattens the idle. But sometimes during standing in the traffic it just drops the idle hectically, then I need to pump on the gas pedal, rev it, then it idles OK for a while.

I noticed that my oil pressure is also dropped when rpm drops. I don't know if it's a reason or a consequence... Normally its 3 when running, 2 when idling, but when the rpm drops it also drops to around 1.5.

I also noticed that it is somehow related to the engine temp, if its over the line that is between 80 and 120 it drops rpm, when its cooled back down under that line, its OK.

And also noticed that as it were better if the headlights are off, so if it were relating somehow to the electronic consumption. Im going slowly in high traffic, let the engine idling, and when I brake, the rpm drops down, as the breaking lights could also affect this...

Also noticed that when its hot and hard to start, then my RPM gauge arm goes up high during cranking with the starter motor, is this normal???

I'm afraid that the problem just got bigger as the weather got warmer here. When I bought it a month ago, it was a few C degrees outside, now it 15 and rising, so I guess I wouldn't be able to start it if it were 30 outside, that is common at summer here in Hungary...

The engine did not stop so far, but I always starts pumping gas when I feel the rpm drops, so I'm afraid it would stop if I let her. When I push the pedal it always revs, and never drops rpm when driving, only when the engine is idle.

Any ideas, please???