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Been having same prob with my 97 3.9. Ive changed complete tune uo twice iac ,dist, intake gaskets. computer, temp sensor. I was wondering if anybody has removed the heat shields around the spark plugs. and if it helped less chance of arcing there
This is a really dumb question.. if it sounds and you think its arching on something.. have you tried running it at night and then watching for the arch? I did that on wifes car and found a broken plug wire arching against the motor..