Quote:
Originally Posted by ZR2
Macroblock, I am a different car and issue from the original thread starter. With the original plugs it did not have a stumble. I was updateing everything just doing my maintenance and when I replaced the plugs the 1st time with the NGK BKR5EIX plugs after about 50 to 100 miles I would say the car developed a low speed / low rpm stumble. Mainly at low rpms 1000 to 2000 maybe. nothing at higher rpms. Today I took out the plugs, yes #8 also, what a pain, and replaced them with some AC Delco 41-800 platinum plugs and sure enough the stumble was still there, but actually worse. I checked the fuel pressure after reading this current thread and it was at about 53 lbs with the rail pressurized but not started. It held to 30 lbs ish after 30 minutes or so. Car idles fine, just when a bit of load is put on it below 2000 it stumbles. I think the heat range of the NGK plugs was probably too hot by 1 or 2 ranges, but I think something else is going on. Car doesn't seem to be missing in the traditional way.
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Sounds like a cylinder or two are off-line. Any fault codes?
Verfiy the ignition leads as detailed in this thread. Afterwards, you will need to verify your injectors and/or the (-) feed to the injectors from the ECM.