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Bad platinum plugs after 27,000 miles?? Or...?

I had began to notice unusual engine vibrations. After first start of the day, it would act like it was going to shut off while backing out. But ran ok for the rest of the day.

Then a few days ago started having trouble getting my car to start. Had spark(per timing light), had fuel(40, per guage),timing marks good, injectors pulsing. No codes. No start!

It started after awhile, and sputtered and acted like it was running on less that four clyinders, then smoothed out a bit.

Changed spark plugs, using ngk BPR6ES. Problem appears to be gone. Car running stronger that it has in awhile.

I have lurking in my mind that this could still be some kind of intermittent freak, but, for a couple of days I had this problem, especially on the cold wet morning(sacramento, 4 days of rain), now it starts right up and runs like a banshee.

The tips of the bosch platinums(27,000mi) that I took out were not fouled. A bit on the dark side, but not far from normal looking. (I gotta get that camera). They were, however, hard to get out. Did I use thread lock by mistake, instead of the copper anti sieze that I usually use? I dont know. But it was a tussle.
Didnt hurt the threads.

Thanks you All

1990 volvo 240 non turbo 207,048 miles






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