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The same carbon build-up in the intake manifold that Phil pointed out is also within your plenum. You can spend time with various chemicals trying to clean it up and who knows??...you may have some success.

Anyone ever experiment with the self-clean cycle of the kitchen oven?? <img src="/forums/images/graemlins/shiner.gif" alt="" />

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'00 Rodeo LS 4x4; "K&N" cone filter; S/S Manik Front, Rear, & Nerf; 'Modest' sound system; 1.5" R'ooper lift, 265/70/16 Dunlop RVxt, Skyjacker Hydros, OEM LSD (sans G80 code)