2004 Cadillac SRX Runs rough with misfires

2004 CADILLAC SRX
65,000 MILES • 3.6L • V6 • RWD • AUTOMATIC
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62CARGUY
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My car has 65k on 04' cadilac srx and runs rough.. I am getting several codes, p0300, p0301, p0303, and p0304. I have replaced ignition coil on cylinder 4 on drivers side, which seemed to have the most misfires, but it seems to not make any difference. I have tried to check for vacuum leaks, but I am not very familiar with this engine. I am wondering what might be the next step to problem solve this?
Dec 13, 2015 at 6:24 PM
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ASEMASTER6371
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I would start with basics. replace the plugs and check the other coils very closely

Roy
Dec 13, 2015 at 7:38 PM
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62CARGUY
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I have already changed plugs, still the same misfire. If iM looking at coils, what should I be looking for if they are bad? Is there a way to test them?
Dec 13, 2015 at 11:40 PM
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ASEMASTER6371
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remove the coils and check the boots for any signs of grey marks that indicate burning inside the tube.

Roy
Dec 14, 2015 at 6:08 AM
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62CARGUY
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I have checked all boots and they all look in great shape. I have also switched the ignition coils around to see if that made any difference. I still keep getting the code p0300 and p0304. Both oxygen sensors have been replaced up by engine, and that has not changed anything. I am not going to replace fuel filter next and then possibly #4 injector. Any ideas would be greatly appreciated.
Dec 17, 2015 at 3:43 PM
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ASEMASTER6371
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check the fuel pressure. low fuel pressure will give a 300 code

Roy
Jan 4, 2016 at 8:26 AM