[porken]

'84 euros are digital, LH2.2/EZF, the same as 85-86 32V, but without automatic idle speed control, or O2 sensor.

It sounds like a Temp II (coolant) sensor. For LH injection, there are two sensors in one, one for the LH, and one for the EZF, so each terminal is measured to ground. (You can't use one from a L-Jet, which has only one sensor inside.)

Could also be vacuum leak(s), and the cold start bypass valve (euro LH only, similar to L-Jet) may not be opening enough.