I just spoke to a customer today who had originally called me to buy a ECU.
He was that desperate to get his van to run properly without bucking.
I encouraged him to check a few more things first before buying such an
expensive part.  He called me today to thank me for not selling him the ECU.
He had discovered the problem and shared what he found with me.

He had the AFM capacitor fix harness installed on the van when he bought it
and it had always bucked, etc.  He replaced oxygen sensor and other wear
items trying to find the problem.  Finally he decided to remove the add-on
harness for the AFM fix and it seems to have solved his problem.  So perhaps
this harness had some bad solder joints or a bad capacitor.

Just wanted to share this with the List.  If you are experiencing the bucking
problem and you have the harness installed, you might want to eliminate it as
part of your troubleshooting just to be sure that it is not part of the
problem.

Hope this helps,
Ken Wilford
http://www.vanagain.com
John 3:16
Phone: (856)-765-1583
Shop:   (856)-327-0027
Fax:     (856)-327-2242