[GhostDakota]

This is for my 98, my "daily driver" that I can't drive anymore! I was driving in to work 1-2 months ago and I noticed some hesitation in 6th gear at 65 MPH. Wasn't a big deal I thought. Then, I noticed it in lower gears/RPMs, and now while accelerating in every gear. It's like a full auto AK-47, for example, in terms of rate (not loudness). It does not happen at idle while revving unless I turn the car on and it starts doing it right off the bat.

My SES light has been on for months now. It's telling me the driver side o2 reading is off. On my drive to/from the Hamptons just prior to all this I hit 2389048923480234 bumps, pot holes, etc., mainly on the Belt Parkway & Staten Island Expressway. Is it possible it rattled my cat apart and is now clogged up?

I don't think it's bad gas, but who knows. I've always run Sunoco 93 octane gas. Over the weekend I was in the Hamptons and had to fill with Hess gas. I ran through that tank after a couple days, and filled up with Sunoco.

I have 109,XXX miles and do not think that the prior owner changed the wires. The plugs are half and half. I just changed the wires to Vengeance Racing:


Also running new TR55 NGK plugs gapped to .055. The gap of the old plugs was at .085!

These are the plugs, set up in cylinder order. Top plugs are the front of the vehicle:


Codes:
P0420 - original code I've had for some time
P0300 - Random misfire detected
P0140 - o2 circuit blah blah (from when I disconnected the driver side downstream o2 sensor)

I got the CRC MAF cleaner. Cleaned it during my lunch break. Still sputtering - mainly under WOT, but it's still there at other points on and off as well. I swapped the MAF from my '01 and still the same issues.

Any recommendations are appreciated. I just want to drive this car and ENJOY it again