good morning
thank you for your response
i am using the South African standard 95 octane unleaded as per the user manual .
the mechanics at the GM workshop confirmed that this is the correct type. they will attempt now to replace the "Loopback coil"(not sure if thats the correct term ) box where the HT leads run from ?
They will give me a shout when the part is sourced , i will feedback .
regards