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I remember in my new design 2000 Suburban I installed a K&M air filter and kept it serviced by cleaning and oiling, but the oil would always yield from the gauze filter and deposit at the base of the throttle butterfly. It would get sticky and keep the butterfly just slightly open enough to...

The posting was old, so I have to assume you resolved your problem with the rough idle … that when drops is in sync with dimming lights. Years ago when most GMs used an HEI distributor, the control module would go into limp mode to get you home and the engine would run like crap. Since...