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I have a 1994 Itasca motorhome with a 454 engine. Lack of power and overheat. What is the correct timing for it? How is it timeed. I unpluged a wire at the distributor which lowered the rpm and checked the timing on top. It was 0 degrees. I advanced it to about 12 degrees and plugged the wire back in. Now about 25 degrees?? Help.