check your coils. again, mine use to run fine when cold until it reaches normal tempeture after a while. then the misfiring started.. I tough or maybe i wanted to believe it was the injector because of price. i end up getting the coil and problem solve. to teste what piston was doing it. while car was running i unplug each injector at the time until finding the one that didn't make any difference when umpluging. and that is the one that is bad. good luck
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