Ever resealed the intake plenum and associated bits? If this has never been done, you need to do it. Before I did this, my 560 would bog going to WOT.

Catalyst could be plugged some too.

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]