Dissapointing news. Spark plugs arrived, changed the easy ones on the right side of the engine (front to say so) and drove the car for about 2 miles, both on idle and even in 5th gear while driving 30 miles per hour it was running PERFECT, like new, no misfire at all, not even the slightest. Then I thought ok everything's back to normal now, let's take the intake manifold off and change the 3 ones from the back side, did so, went for a ride again, and everything went back to being wrong again, misfiring on idle again, although just a little better while normally driving...
I can't imagine now really. How can it be that with only the 3 front easier plugs replaced with new ones, the engine runs perfectly smooth again and after changing the other 3 ones with new ones of course, it misfires like hell again? This is really frustrating now.
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