where does this go!!

[fatfrosty1966]

having just picked up my new ride from Karl at Wolfsburg Wizards,we have a mystery wire! Karl did a swop job on the Fuel injection for a carb setup and whilst it would appear the other wires are going to the coil i have mystery wire coming out of the carb near to the base towards the back of the van,maybe this would help the idle from cold which is non existant at the mo,any help grateful as i suspect some sensors etc will be different on this setup so cannot use some of the advice found so far

[Hacksawbob]

probably carb pre-heat? pics and or wire colour might help.

[fatfrosty1966]

thanks for info,have joined on a carb thread which has loads of related info