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
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2 answers
ANSWER by , 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 , 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.