what does codes P300,P301,p302,p306 mean and where do i start on problem on 2001 Toyota Avalon

changed spark plugs and running great until I stopped and got gas a little later it started misssing and cel started flashing. running so rough thought i was having a flat tire.

by in Naples, TX on February 18, 2013
2 answers
ANSWER by on February 19, 2013
poss coil paks are bad or circuit issue.have live data read to determine if its circuit or coil paks
ANSWER by on February 19, 2013
Re-check all the coil/plug connections and IF it wasn't running like that before getting the fuel, take a fuel sample to be sure there's no contamination , although if it was bad gas , it should have all cyl. misfire..... AND follow #1 advice.

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