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Originally Posted by 1983 300 4x4
I just replaced the old head on my 4.9L because it was carcked about a month ago. Now two weeks ago it started struggaling to idle and accelrate.
I put brand new champion copper plus plugs in and gapped them at .042. With the new plugs it still run the same way with a black carbon build up on the plugs. Any ideas?? Thanks in advance yall.
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Choke may be sticking shut.