D22 ticking over at 1500 rpm

[Mark J]

My 2005 Navara D22 is ticking over at 1500 rpm, except when in gear with the clutch depressed, when it ticks over at the normal 1000 rpm.
It started right after I had some welding done, and I wonder if something electrical got fried.

 

[tweak'e]

check the idle up switch is not on.

 

[Mark J]

It was. Thanks for that. I didn't know that I had one of them. I thought it was a switch for heated seats!