Car wants to bog

[Freakshow]

I made a short video of what my car is doing when i barley tap the accelerator, when i slowly tap it everything works fine and it doesnt hesitate or bog at all it only does it when i give it a slight tap. I tried to ask local garages for their opinion but some of the responses i got sounded like they had no idea what i was talking about or no idea what they were talking about. One person even tried to tell me "that's normal for old cars" but i dont think so..

Here's what I have tested out so far Icv valve is fine and even cleaned it out put the oms meter to it and it read a strong 20+oms.

Checked for any vacuum leaks using carb cleaner but didnt see anything so that could also be ruled out but not 100% until i get a smoke test done.

Cleaned out the maf today it was really dirty so i'm glad i did it the car ran better after and i noticed a slight difference.

The only thing left I could think of is the throttle position switch which i have yet to remove and give it a good clean.

Also i adjusted my valves earlier but they still kind of sound the same will valves adjusted incorrectly also cause this kind of bog/hiccup?

Anyone else had this issue on their car? it's a 89 325i

Video: sorry not the best of lighting but it starts acting up around 0:14 and at 0:40 https://www.youtube.com/watch?v=t4Xs0ACe9ZA

[jlevie]

The first thing I'd suspect would be intake leaks.

[Freakshow]

Yeah i'm going to have to get a smoke test done. Also going to check the tp switch and see if its working correctly and adjust it if needed.

[Freakshow]

Can a bad crank sensor also cause this? It takes me a few seconds of cranking until the car starts up, i looked and it is completely covered with grease and thinking about replacing it even if it doesn't solve this issue.