Good advice, Dana.. and much appreciated. The problem was ignition wire to
cyl. 7.

-Mike

--
A happy kid behind the wheel of a 98 Mustang GT
Cold air intake
FRPP 3.73 gears
Steeda Tri-Ax Shifter
Flowmaster 40 Series mufflers (self-installed woohoo)
Hi-speed fan switch
255/60R-15 rear tires
Subframe connectors
Aluminum adjustable clutch quadrant


"Dana H. Myers" > wrote in message
...
> wrote:
> > Check engine light JUST came on... so I immediately pulled out the code
> > reader & got:
> >
> > 0307: Cylinder 7 Misfire Detected
> > 0174: System too lean (Bank 2)
> >
> > Car stumbles/hesitates when accelerating... idles fairly rough. Any
ideas??
> > Thanks in advance!
>
> I'm not an automotive service tech, so this advice
> may be worth what you paid for it. :-)
>
> For the most part, engines don't work correctly when
> there's a problem with fuel or ignition (or both).
> You're apparently having a problem with one cylinder,
> and a too lean condition suggests a problem with
> fuel. So you might have a dirty/clogged/tired
> injector on cylinder #7, but that's just a guess
> without looking at the car at all.
>
> First pull the plug on cylinder #7 and make sure it's
> not fouled and is gapped correctly, and make sure the
> plug wire isn't arcing to the engine anywhere. I'd
> expect faulty ignition on one cylinder to lead to a
> rich exhaust condition, actually, but it's worth
> checking.
>
> Also check for a loose hose or fitting, and rule out
> a vacuum leak.
>
> I'd run a bottle of Techron injector cleaner on the
> next fill-up, but, if everything else is working
> correctly, you may need professional injector service.
>
> A malfunctioning IAC will make the entire engine
> idle low/roughly but I doubt that it would lead to a
> lean condition on one bank only.
>
> Good luck -
> Dana