Car won’t idle right.

Hey guys,
I have a 2012 5.0. Mods are boss manifold, longtubes, jlt 2 cold air, Lund tune. The car will not idle steady. It idles good then gets this patch for a second and goes to die then catches itself. I have gotten this on a datalog for my tuner and he’s been trying to help me track this down. The plugs and o2s were changed 1700 miles ago. Took the plugs out and they looked fine. Im the original owner of the car and it’s always had a idle like this. It’s just never stalled. Today it stalled for the first time captured on a log. Could it be a bad maf sensor? Suggestions?

Thank you,
Anthony


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What are your STFT's doing from side to side? Could have a bad O2.

sur_real1 said:

What are your STFT's doing from side to side? Could have a bad O2.

Click to expand...

They were fluctuating but my tuner doesn’t seem to think they were o2s. Especially since I just replaced them and the issue happened after the new ones got put in.

I cleans the maf again, fixed the exhaust leak and then disconnected the battery do 2 hours and got a log. My tuner says it’s better and to drive it 50 miles then re log idle and rev holds.


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