Is your check engine light on? If so check for codes in the ECM. Are you
sure you arent leeking?
A bad PVC valve could have fouled your plugs. Althought your plugs are
only bad on one side, could be bad ignition parts.(cap, wires, make sure
the wires are snug too.6 mpg seems awfully bad. I had a jimmy with a bad
O2 sensor. Less power, more gas.But not that bad.

Haven't had that car for some time, so I can't repeat the test.
However I did drive it with the 2 plug wires completely removed, with
no noticeable difference. That wasn't on the interstate unfortunately,
so I can't say what it would've done at higher speeds.

I do remember that once it started running so bad, I had to keep it out
of overdrive to maintain any speed.

~jp

Jon R. Pickens wrote:

Pull and inspect those two plugs

--

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www.thesnoman.com

I will repeat:

That P.O.S. sat for months here in Atlanta, then I towed it back to TN
where it sat for a couple of years before some dude left a note on it
stating he wanted to buy it for parts.

I was rather disappointed that my financial situation didn't allow me
to haul it all the way to a large canyon/hole in the earth somewhere
out West so that I could have the satisfaction of pushing it off the
edge and sending it to a firey grave. I hated that damn car.

~jp