i had a similar problem , where it would cut out when you slowed down, that was on a hot few day trip to europe. I replaced the leads and plugs and coil, with new items, and added a thermostatic engine bay fan and it never gave me the same problem again. has the fan been running when it cuts out? its always smelled rich due to the over pressure from the turbo pump and the mk1a's inability to deal with fumes. tps should be perfect , although its worth checking/reseting, instructions in the binder. there are some very thick earth straps on the engine, -> front lower crossmember chasis rail, and one on the gearbox/head, check they are still attached/have continuity. there is an afm earth check it has continuity etc to chasis. safc might be worth removing/decommisioning if you cannot get to the root cause , its not difficult, the soldered joins are under the black tape , shrink wrapped, you could easily remove them. ecu has a seperate earth next to it also, check it.
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