Trouble Code 0307... help please.

Can anyone tell me why my car idles rough? It got worse when I first started her up this morning... then threw a DTC 0307? but then it smooth out a little as I was driving. Is this a misfire on cylinder 7? Felt like the car was running on only 7 cylinders. This happened once before last year and the car threw an 0306! Any ideas why she's misfiring on the drivers side of the engine?

My car had a rough idle since 55k. It's at 80k now. It's not the coil packs, plugs, fuel filter or wires... they have been changed since the first time this happened. It still idles rough- ONLY at idle.

Any thoughts? Please help before I get ripped off at the dealership.

Any ideas?

03gtmustang said:

Have you done anything intake wise?

Click to expand...

The only thing I have is a K&N with a the snorkle cut down and widened with a piece of 4" ducting. I did have a MAC cold air induction about 3 years ago but my car bitch so much, I took the stupid thing off after having it for a month. I cleaned and checked the mass air meter wire too.

Everything else on the intake is stock.

I wish I owned an Autotap.

...this is so aggravating. I wish I knew a mechanic in Chicago.

...oh well.