Help me solve the mystery

My 1.1 golf has had an intermittent problem which is driving me bannanas - I am losing the plot.

At a seemingly random time - I cant find a pattern….sometimes uphill,  more recently 'seems' to be once I reach around 35miles per hour the car begins to chug/kangaroo.

I had thought it was a fuel problem, but the filter, fuel tank, pump, tubes, carb have all been checked and replaced.

Also the points in the distributor, the leads, distributor cap and the coil have all been replaced….still happening  

Can anyone help?

Reason I am posting in 'electrics' is I seem to have exhausted the fuel starvation angle and when I tried to drive the car last night in the rain the problem which seemed to have been reducing was rife happening repeatedly…so I am thinking it might be something electrical which doesnt like the rain? (It was dry when it happened on previous occasions tho).

Can anyone help? I repeat that bit cause it is driving me to distraction.

Other random (potentially useful) info:-
The car has a Toad Ai606 alarm/immobiliser fitted - is there any way faulty wiring or anything with that could cause this problem.

Otherwise the car is in great condition, starts first turn, ticks over well, sounds good, body work is brilliant and very low mileage.  Just this niggly problem.

Yours hopefully/desperately   :dontknow:

After reading this guide on fitting the Toad A1606 and particularily the bit quoted below - could faulty wiring be cutting out my fuel pump at random times or under certain (undetermined conditions)?

"Right then, All of the wiring above is what is needed for the alarm to work as intended, what is left is just connecting up the immobiliser. This is simple, you have four wires that make up two circuits. For the immobiliser to work you need to cut out a wire that is curial for the vehicle to run and join it into one of these circuits. You have two circuits so you could immobilise two different critical wires on the car - it is up to you to choose which wires to immobilise. The best circuits are…
 
STARTER
FUEL PUMP
COIL 12v
INJECTORS
ECU"

1.1 has a mechanical fuel pump doesnt it? Maybe under load the spark is breaking down. Have you checked plugs, leads and coil?

89clipper said

1.1 has a mechanical fuel pump doesnt it? Maybe under load the spark is breaking down. Have you checked plugs, leads and coil?

Thanks for the reply. Yes mechanical fuel pump, which has been replaced, checked and working. The leads and coil have been replaced, the plugs have not - could the plugs cause the kangaroo/chugging symptom?

Not sure mate, when mine did the same thing it turned out the fuel filler neck was rotten and crap was sucked thru to the carb.