200 might be sick again, then again.....

[Geraint Lloyd]

Hello all,

drove from Montreal to Niagara Falls yesterday
a realtively uneventful trip.....
Still, here i a transcript of a conversation I had earlier today
-Mornin'
-Morgen
-how are you (pulled ECU codes)
-Ich bin sehr well zank you (blinked out code 4444) 
-You sure about that? you were trying to tell me something yesterday. (intermittent 'check engine light' that "just might" only be at part throttle, which lasted for 500kms)
-Nein, Ich bin fine, and i really don't remember zat yesterday (blinked out 4444 again just to be sure)
-Ignorant b at stard

as ever the victim is an '89 10v 200TQA MCII

So I have an intermittent check engine light and no codes stored in the ecu.
it "seems" to be related to throttle position (1/3 depressed ish.... so rheostat?) but could just be the engine condition/load related to that position. I checked the fluids and filled up with shell 91octane in case it was a knock issue. 

shell 91 seems to reduce the pinking in the golf compared to other brands, can't think why but there we are..........(the golf was built for 98RON or 4-Star Unleaded).

The light seems to come on after 2hours plus of driving. the frequency
dropped after i stopped for fuel and a double whopper + cheese, then
came back 200kms later.

like an @rse i left the full tool kit and 3 volumes of bentley at home, since the wife insisted on bringing clothes of all things.......
honestly the cheek of it!

any ideas guys?

Geraint