If the fuel distributor is changed, I'd recommend changing the injectors and plugs at the same time.

I would have the entire fuel-system checked starting with the fuel lines and pumps/relay. Then have a look at the idle control valve. If you suspect its the OVP, have an alternative OVP plugged in and observe the engine behaviour before paying for it.

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... Kerry

126 tailed by a 203, 129 leading the pack.