Re: crossfire manual shifting "downshift " issue
Throttle body. That was it. Bunch of $ spent on other parts, some had to be replaced as well, some not. The issue was caused by a faulty throttle body and brittle connectors, both replacements purchased from Rob @ Needswings ( great seller, as you all already know )
No warning light, no code.. just due diligence by a mechanic who had enough experience to discover the issue. Props to Cesar Ochoa and "Performance Plus Auto Repair" in Coral Springs, Fl.
for their excellent work.