progress has been made - will post here so it may help others (frustrating doing the searches and most are dead ends)
Installed the 2 cam & 1 crank sensors + 2 knock sensors.
Removed the alternator - then did it the hard way by leaving the plenum on to do the knock sensors.
All good - problem fixed. Looking at the removed sensors I'd guess the knock sensors were playing up when hot, other sensors were just dirty.
At least it was not the wire harness for the engine which I was dreading - it is quite hard and brittle.
Now starts first go every go - just like the maker intended.
Thanks for the inputs
bruce
