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I had the same kind of problems as cfg83 did, I've had the pulse plugs in my vx for about 150 miles, mostly driving 10+ miles at a time, and when I let my car idle while going down a hill or at a stop sign, my car starts to run really rough then dies! so if there is any improvement in mileage it would be because my car doesn't spend any time idling, I haven't had the time to swap back to NGK plugs as I've been working more in the last few weeks and only driving the vx while I'm installing two new chargers in the Comuti-car.
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