Well I guess opti problems are not always related to the opti itself. When I was starting to look at my harnesses and such to install a Delteq I noticed this (see pic in link below). That is the connector on the passenger side of the intake manifold that runs down to the opti.

http://bedford.no-ip.org/images/my_e...i_harness2.jpg

When I found it, it was all twisted so there had to be some shorting and degredation of signal going on. Looked about like this.

http://bedford.no-ip.org/images/my_e...ti_harness.jpg

It has now been removed and soldered with no connector. Drove it all day and it didn't miss a single beat to 6500rpm.

 

It's pretty obvious in the first pic that the wiring had a real problem.