[Skye]

Trying to diagnose this problem I put in a new ignition and O2 sensor before the cat. Nothing helped.

Today I put back in the old ignition, disconnected the battery, let it sit for a bit. I started it up, it sputtered once but the engine light was off, it seemed to smooth out. I took it for a spin down the road. It seemed to get up to temperature quicker than I expected it would, but it never went past horizontal. Ran like a top, not a single problem.

I hopped back in to take a longer ride, it seemed to want to start sputtering when I turned on the heat (it's cold out) but I figured I'd go anyhow and see how it acted. I took it to Blockbuster, no problems. I drove it to the mall, no problems. I got back out of the store, cranked it up, it's running like total crap again. Engine still throwing no codes.

I've got to limp it home so I start out of the parking lot and it's bucking like it's running on 3 cylinders. I start down a road and it's backfiring under the hood. I stop at a light and it's rhythmically bucking. Lights green, start moving again, still running like total crap and backfiring like crazy.

I made it home, still not the first light on the dash.

More new plug wires?

Thoughts? (2004, non-turbo, auto, 75K)