You were right about the relay. It seems that the unstable idle after weeks of investigation is the Fuel sending unit. I'm told that one of the wires is broken... [ http://www.fcpgroton.com/product-exec/product_id/14910/nm/1990_1992_Volvo_740_8_Valve_Fuel_Tank_Sending_Unit_Regina_Injection/category_id/302 ] about $455 + fuel feed line so looking at $555 not including any labor.
You know much about this? You can't just replace a wire can you?
Anyways, thanks for all help up to this point, I'll let you know the final results.
Forsyth
Also, do you know anything about the validity/quality and such of this website [ http://www.thevolvosite.com/740/volvo-740-fuel-system-and-related-parts.html# ] their price is about $50 less - I think it is OEM & New.
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