p0300 trouble need advice please
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Join Date: Feb 2013
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p0300 trouble need advice please
so i had my long tubes put on than i extended my 02 sensor wires the upstream pre cats i installed them all went well for a while, car had loads of power than all of a sudden it start to missfire pretty bad, idle ranges from 900 rpm to 5-600 rpm and while driving the car stutters and bogs out of power runs very heavy, the check engine light flashes occasionally i know its a missfire but i do not know where to begin i have p0300 code coming up random missfire my dumb freind decided to clear all the codes so know i cant even go back to them there were 2 others for the down stream 02's i beleive, any advice?