2005 Corolla misfires

[quote:b5ed75b729="PeachcornShank"]Hi - 2005 Corolla; 38K, 4 cylinder. I had a misfire on the highway last week and the CEL came on. Took it to the dealers, they run the diags and determine it was a faulty fuel injector, which they replace. Got it back and it happened again the next day. I brought it in again and this time they suggest that I have a fouled tank of gas and make no repairs. Given that hypothesis, I'm driving through this tank but still getting misfires every 30 miles or so; CEL comes on after a misfire and then turns off. So far I've misfired on the highway doing about 60, getting on the highway, and taking a left from a stopped position. Any ideas what could be causing this behavior if the diags say nothing?[/quote:b5ed75b729]

So what is the P0300 series? for the misfire the injector ain't telling me nothing yet. I need the no.s before I can help.

[quote:7f73dacc1e="rasmataz"][quote:7f73dacc1e="PeachcornShank"]Hi - 2005 Corolla; 38K, 4 cylinder. I had a misfire on the highway last week and the CEL came on. Took it to the dealers, they run the diags and determine it was a faulty fuel injector, which they replace. Got it back and it happened again the next day. I brought it in again and this time they suggest that I have a fouled tank of gas and make no repairs. Given that hypothesis, I'm driving through this tank but still getting misfires every 30 miles or so; CEL comes on after a misfire and then turns off. So far I've misfired on the highway doing about 60, getting on the highway, and taking a left from a stopped position. Any ideas what could be causing this behavior if the diags say nothing?[/quote:7f73dacc1e]

So what is the P0300 series? for the misfire the injector ain't telling me nothing yet. I need the no.s before I can help.[/quote:7f73dacc1e]

I assume this is the specific code that rang up on the diag test? I don't know; doesn't seem to be indicated on my receipt. I'll find out what it is.