illegal. WOF time...
Join Date: Mar 2012
Location: New Zealand
That sounds electrical - check your battery leads and that all the plugs are tight in their sockets (the ones near the throttle body such as the crank sensor, the MAF, the ecu itself etc). If they are making poor contact they could be causing brief voltage drops that are interrupting the ecu. Maybe pull them off, check the contacts are clean, then re-seat. With the engine running, wiggle a few things and see if you can cause the fault.
I have never heard of an Alfa with an intermittent electrical fault, yours must be unique.*