Update:
All elastomers exposed to vacuum replaced with new OE. Measured vacuum in the MAP sensor hose: Near atmospheric.
The only remaining part is the 4-way connector which I have coated with epoxy and pressure tested under water. However unlikely (to me) it must be leaking somehow.
Also fitted 6 new spark plugs. Old plugs were clean and wet. New sparks made no difference.
Ordered OE 4-way connector and a domestic sourced garden X connector. Whichever comes first will be fitted.
Also ordered new OE HT cable kit. Will replace the high voltage aftermarket coil/cable setup with OE only.
Somehow I will get it going properly. Really appreciate all your help and support!
