Hey guys,

My car is doing a weird thing where as soon as I turn it over in the morning - it slowly builds up the revs as soon as I turn the key, if you look at the taco it sort of idles around 500-700rpm for a moment, like it is thinking of dropping out, before firing up to 1500 or whatever like normal.

The battery is new, starter motor is fine so I don't think it is electrical and the engine itself and everything about the car is smooth after this point.

Could it be from the air-con being on at start up?

Thoughts?