not sure, but you may want to check the vacuum lines.
also fuel filter as stated above. I know my M42 needs 91 octane, make sure you are running premium gas, i know mine vibrates and knocks with crappy gas.
also check your O2 sensor.
We all get the urge...Saturday early morning...nothing to do till noon...
The aural sensations of 1st gear WOT
**CGM **(Certified Garage Mechanic)