It could be you have improved the MAF connections by the unplug-replug process.
A trick that works with the E32 is to disconnect the battery and then join the cables (not the terminals)n together. This erases the learnt part of the ECU programming.
Sometimes it works, sometimes no difference but it is a cost free process. Let the wires shorted out for an hour or so. Sorry - you will have to reset the clock and radio. | 
Hybrid Mode
