Bank 1 plugs darker than bank 2. No codes
03 gt btw. Not by a ton but bank 1 has noticeably darker s plugs. Pretty clean, but a couple shades darker. Every now and then my idle will be a tad random, like when coming to a stop usually hangs at 1100 until I stop sometimes it's 1400 others it drops to idle before I even stop but always rests at ~800 and smooth. Sometimes when not fully warmed up at low rpms in any gear when giving it a little more gas it will kinda lurch a little if ur looking for it. But nothing bad it's a very smooth running car. Some times it randomly pulls a lot harder at wot than usual and seems like half or 3/4 pulls just as hard sometimes.
Pulled codes there are none. Things I've done: brand new ford maf, rebuilt injectors, clean kn filter, clean iac, clean tb and plenum, gapped plugs, new fuel filter, changed oil.
Car is stock except kn filter, super 40s and or x pipe with mil elim. Has 170xxx on her but previous owner garage kept it and drove hwy mostly. One of the cleanest stangs with that mileage. If there are no codes and fuel trims and all look good (dad data logged it at work for me) I'm out of ideas. Maybe a small exhaust leak or weak O2? Thought they would cause a code but who knows. Maybe cam timing? Doubt it but any ideas guys? Maybe nothing at all?
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