E39 520i refusing to rev

[Venom]

I drove the car, parked it no problem. It sat for 3mths so I hooked up the leads and it started first Turn. The only thing I did between times, I removed the abs unit and now it won't rev past 2500rpm. Any ideas?

Sent from my Vodafone 858 using Tapatalk 2

Sounds like limp mode or something to that effect. As in the car knows the unit is removed and as a safety feature won't allow any hard driving?