Should I do a computer reset?

[BillionPa]

if your idle goes downhill after running like a dream, your O2 sensor or MAF sensor needs replacing.

[eem2x]

One think to keep in mind... my idle issues (M60) resulted from the computer doing it's job properly based upon the inputs it was receiving from the O2 and the MAF. Garbage in - garbage out.

My first inclination was that THEY were the problem but ultimately it was from the intake manifold gasket. I found when working with a rough idle investigate the parts that are core 'blocking and tackling' of the sytem: vacuum leak in the intake manifold gasket or valve cover gasket, the e34's version of the PCV, which is the oil separator and the corresponding backplate, the throttle control valve (easy to remove and blast with solvent), the oil cap and dispstick leaking air. Once these are verified then it could be the O2 or mass air flow sensor, but with no moving parts they'd be last on my list. Good luck!