HiRick, a couple observations. The 28psi spec was updated by Volvo in a service bulletin many years ago to 30 psi. Apparently breaking the seal and adjusting the MAP is a no-no. Do you have the correct MAP? Do you have the FI Fault tracing manual?
https://volvo1800pictures.com/document/fuel_injection_fault_tracer/fuel_injection_fault_tracing.pdf
Try this website. You can sign up and ask in the forum your question. They will answer in English. There’s a ton of info on there. Make sure you click on the British flag in the top right hand corner to read in English.
https://jetronic.org/en/d-jetronic
Both of those sources have been a great help on my ‘71 E. I don’t experience loss of power above 3000rpm, but I don’t have an AFR meter.
I recall reading that Djet tends to run lean on our volvos.
Good luck, and keep us posted.
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