I changed the plugs on both my 1999 focus and my wifes 2002 1.8 petrol focus's at the weekend since then both cars have been trying to stall? It happens when they are warm, both start fine and run ok and the tick over seems ok but from time to time after driving and stopping or slowing down the battery light flickers and then the engine stalls?? The new plugs i fitted were NKG plug's and were the right ones for the engines. The old plugs were quite burnt with a huge gap, maybe 3 - 4mm. the book says 1mm which is what the new plugs are, could this be too small?
James
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