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i have a 2007 screw with about 8,000 miles. every so often while idling there is you feel a quiver. i have used 2 cans of berryman's injector cleaner. could a plug be cracked or a coil going bad? thanks
my 04 does the same thing when it idles at temp. i have 60000 miles on it but i dont think its a big deal. at least your using the right cleaner. I swear by berryman products.
I have an '05 5.4L that does it sometimes and sometimes not. Had Ford check it under warranty and they didn't find any computer codes or anything out of whack. Doesn't affect driving at all.