Slight surging while decelerating / coasting

[Norwegianmopar]

We have the Haibeck chip and the mentioned surge. However, when we pulled the plugs the other day we discovered the gap was 1,25 mm, not 1 mm like Haibeck told me they should have. After correcting this the surge is now way less noticeable, and the car runs way better too, feels lighter and more responsive if you know what I mean, especially on lower rpm's. It also "dances" with the rear tires struggling to grip at 6000 rpm like it did around 7000 rpm before this adjustment. Funny how much the plug gaps could mean power wise.

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[S.hafsmo]

I'll might have to check the plugs then. The surge is rather annoying. When coasting down a slight decline, it cuts fuel every 4 seconds, for approx. 0.5 seconds.

I'm generally displeased with the fuel management of these cars, with the increased idle after start up (1-2 seconds?), high coast idle, surges etc. Doesn't feel as refined as one would expect from Lotus. Though it could ofcourse be that these things are promoted by wear and tear on mine. I'm also starting to speculate if someone gutted the cats, as it's incredibly loud with the Corsa exhaust, and not in the good way.