Need S50 help. Car runs but poorly

[Munich Man]

Alright guys, I've posted similar threads before but after trying suggestions that many have had, it's time I ask for help. It cuts power while I'm driving randomly. I can floor it on the freeway sometimes and it'll be fine, and other times it'll bog around 3,000 RPM's or so. Really frustrating me because I've tried so many things and I'm just not sure.
Stuff changed:
O2 Sensor
MAF Sensor
ECU
Vacuum lines
and other stuff that I'm forgetting.
The car also has a weird sounding idle.
If anyone who's done the swap or knows a lot about it can come check it out, it'd be greatly appreciated. I have money and will pay you if we're able to figure out what the hell is wrong with my car. I just want to have fun in my E30 again :(
You can text or call me at (425)-367-231FIVE. I live in Mukilteo and am available all day today, and anytime during the week after 3:30. Thanks in advance!

[ser1992]

Sounds like it could be a problem with fuel? I had a Silvia and whenever the tank got halfway or lower it would drive like how you described. I put in a walbro 255 and changed the fuel filter and it fixed it.

[e30austin]

Did you ever look at knock sensors?

[e30austin]

VANOS could be taking a shit, too.

[Munich Man]

Did you ever look at knock sensors?

I didn't. Could that really cause it? Or is that more referring to the rough idle?

[Munich Man]

Sounds like it could be a problem with fuel? I had a Silvia and whenever the tank got halfway or lower it would drive like how you described. I put in a walbro 255 and changed the fuel filter and it fixed it.

I'll go fill it up and drive it around for a little haha. I'll let you know.

[e30austin]

That whole system works in sync, like an orchestra. If one of the main components isn't there or working properly, it will fail. Go drive it around with the MAF unplugged and see what happens (puts it in limp mode.

[Munich Man]

That whole system works in sync, like an orchestra. If one of the main components isn't there or working properly, it will fail. Go drive it around with the MAF unplugged and see what happens (puts it in limp mode.

Should I keep my 02 sensor plugged in while MAF isn't?

[e30austin]

Yes.

[Munich Man]

Yes.

Alright, I'll fill it half way and unplug the MAF. I'll get back to you guys soon.

[Matt-B]

As others have said, check knock sensors, check tps, for obvious vaccum leaks and that the front trigger wheel is on correctly, and the motor is timed properly.

[Munich Man]

Put a new TPS in a couple weeks ago. Drove on a full tank and it still cut out. It runs fine when it's cold though. After it warms up it gets sloppy. MAF didn't really do much. Couldn't really tell but if anything probably ran worse.

[Matt-B]

Ecu temp sensor perhaps?

[Wanganstyle]

Have you pulled the check engine codes?

The bmw computer is designed to tell you when something is fucked up.

If your check engine light doesn't work it would the first problem to solve.

Sent from my SAMSUNG-SGH-I337 using Tapatalk

[Munich Man]

Ecu temp sensor perhaps?

I changed both of the sensors, and now the temp gauge on the cluster flaps around like crazy. Haha, it looks funny.