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Reply to "Engine misfiring"

The safest thing to do is to change to new plugs.
The plugs do have to be carefully checked for everything before the go bqck in.
I use 80 to 100 psi of air to blow them out and then check for trapped particles.
The more one changes the plugs the more at risk you are.
Carbon is the main component of the contaminant on the fouled plug. If some of the gets loose it will score the walls also, not to mention carbon from the valves of valve seats or oil hardened on the valves from valve sem accumulation.
It's a tough world out there...be careful
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