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On my 77 I just replaced the plugs, removed the ground strap, installed the jumper wires between each plug and hooked plug #1 up to the existing relay system. I did this about 3 yrs ago and have had no problems at all. I don't see any real need to keep the plugs on after the engine starts since I don't have any post-start idle problems. Made a HUGE difference in cold starts (below 10 degrees fahrenheit)
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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