Lost HP, Car won't go over 3000 rpms and starts jerking , What can it be please help?

[oleh]

I just replaced the fuel filter, it still does the same thing. I put the car in neutral and put the handbreak on. Reving the engine from engine compartment it still was jerking the engine the same way when it goes to 1500 rpm. When the engine is idling there is no jerking it runs smooth.
-Could it be spark plug wires?

-I checked my engine codes, the code goes 1233 which means Throttle Wide Open Throttle Switch. Could that be the problem? If yes were is it located? Do i have to get a new one or can it be fixed?

Someone plz help me!!

Yes its an M30 Engine 3.5L

[Jeff N.]

Check for a loose crank position sensor. Search the archives, should be instructions. Or on BMWe34.net...

[Blitzkrieg Bob]

Could be a couple of simple things like, fuel filter and tune up or

could be something more funky like the MAF/AFM

[oleh]

Could be a couple of simple things like, fuel filter and tune up or

could be something more funky like the MAF

I dont know i just bought this car awhile ago all i replaced is spark plugs.

Whats MAF?

[632 Regal]

yep, check the CPS first, then replace the fuel filters (note the correct direction of installation) and then go from there.

Could be a couple of simple things like, fuel filter and tune up or

could be something more funky like the MAF

[oleh]

Were is a crank position sensor located?

[oleh]

What is CPS and were is a fuel filter located sorry i dont know alot about beemers.

[632 Regal]

AH HAH! WHat plus did you use???

[oleh]

i checked my engine codes, the code goes 1233 which means Throttle Wide Open Throttle Switch. Could that be the problem? If yes were is it located? And what do i have to do to fix it?
Im using NGK G Power Platinum Spark Plugs.

[Blitzkrieg Bob]

is it smooth?]