Sounds like a very similar issue. Which small electrical box are you referring to? Are you referring to the multi-pin AMP connectors on the MPEM? A photo would be helpful.
Thanks in advance
Joe
Thanks for the advice....took all connectors apart and cleaned them. Figured I would change out fuel filters as well. Running great. No more surging or cut out. Filters flowed well, so I am suspecting it was the electrical connections as advised above. Thanks