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Old 03-29-2017, 06:45 PM   #1
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99 Itasca with 454, what spark plugs?

Title says it all but can anyone tell me with certainty what spark plugs I should use on my 1999 Itasca P32 with 454?

The plugs that are in there now are Autolite AP 605 with gap of .050

I have a problem when going up a steep hill, and the tranny downshifts, rpm goes to 2500 and the MH starts to shake and shudder.

Just installed Banks Torque headers and new Cats.
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Old 03-30-2017, 08:36 AM   #2
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So I went to Autozone website and looked for spark plugs that are recommended for my specific vehicle and the one that came up was AC Delco RpdFire Platinum. From all I have seen on this forum, people have said to gap them at .045 for their 8.1 litre engine. Is the 7.4 (454) the same gap?

Thanks
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