pioneerpimp
5,000+ posts
CarAudio.com Veteran
where did you hear this at? i know ALOT of people that run SF without changing there 02 sensors.it's not recommended that u run SEAFOAM unless ur going to change ur 02 sensor after u run SF, which u have done already. Start off ez, check the plugs, and make sure all the wires are connected and no bare wire showing. Then move on.
could be plugs, wires, distributor and/or rotor. cattlytic converters, vaccuum, gaskets...alot of things