If your plugs are fouling it is due to valve stem seals leaking. Very common.
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Originally Posted by Heep
Thanks for the reply. I suspect the same. The car has 199,999.5 miles on it 
Not that I would ever advocate such a thing of course, but I wonder how some straight pieces of pipe in their place would affect the running? Don't NA gas engines like some backpressure? |
I hollowed out the precats on my 300TE last year. Can't say I notice a difference. I only did it since they had heated up heavily due to oil consumption via valve stem seals for a long time from the P/O. Sounds same issue as you.