Pull a spark plug (or all of them) and look at it. You can learn a lot about your ignition condition by looking at your electrodes.
Also, if your car is actually hunting for idle (revving up to ~1500, spooling down, repeat), check the line from your IACV to your intake boot. I've found cracks in those that cause weird choppy idle conditions. Make sure to give your vacuum lines a very thorough once-over, because a crack in a hose can cause stranger issues than a totally fucked hose.
Also, you say your hose clamps are all tight as fuck, which they really shouldn't be. You just have to go until the clamp starts to crush the rubber. Overtightening hose clamps will just cause premature hose failure down the road...
Also, if your car is actually hunting for idle (revving up to ~1500, spooling down, repeat), check the line from your IACV to your intake boot. I've found cracks in those that cause weird choppy idle conditions. Make sure to give your vacuum lines a very thorough once-over, because a crack in a hose can cause stranger issues than a totally fucked hose.
Also, you say your hose clamps are all tight as fuck, which they really shouldn't be. You just have to go until the clamp starts to crush the rubber. Overtightening hose clamps will just cause premature hose failure down the road...
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