ECM sensors

Hello everyone I have a 3406e 6ts vintage that has seemingly fuel or injector or ECM problems after the engine warms up to 195 degrees. Motor stumbles on up shifts at approximately 1450 RPM sometimes lower sometimes higher but more consistent at 1450 after I reach Highway ground speed so to speak it seemingly quits or at least I can't not tell it..

my question becomes does this engine have any way to monitor ground speed or gear selection it definitely has white fuel smoke when it stumbles I can accelerate hard and then it will accelerate through the feeling and stumble problem.
The other thought that I have is are these ECM prone to break down after the ECM itself warms up to particular temperature because colder mornings it seems like it takes a lot longer for the engine to develop The Stumbling problem thanks in advance