Went out to fit new spark plugs. Ended up fixing my wideband, installing injectors, replacing the fuel pressure regulator and cleaning the throttle body. No spark plugs fitted. I'll do that tomorrow and flash in the tune for the injectors. I thought my wideband sensor was dead. Plugged in a new one and no luck. Turned out it was a bad crimp connector. Resoldered all the wiring and it is all good. Spare new sensor now I suppose. For what it is worth, AEM confirmed for me that the Bosch 17025 LSU 4.9 sensor and the AEM-branded LSU 4.9 sensor are samesies. Just buying the Bosch is about half the cost, so might help someone else sometime knowing that. I suspect it is the same for Innovate, etc too. Given my sensor has been driven around for a couple of weeks unheated, I suspect I'll need the new one sooner rather than later.