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Re: spark plugs in 4200 i6
Take the air intake assy off, this exposes the coil packs, remove one at a time and replace the plugs, stay with AC 41-103 at .050 gap, do this engine cold of course. Forget the F-150, I swore I wouldn't do them again, they really have to be cold and even then some threads have been pulling out of the heads 4.6/5.4.
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