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Hey guys, I have encountered an issue I've never experienced. Nearly 2 months ago I did a CAT delete and installed my down pipe. The rookie mistake I made was I didn't get it tuned and I drove the car for a month before running into some idling issues. I went back fully stock and the issue is still there. It was running really rich so maybe its a fueling issue when I had the downpipe. I replaced the motor mounts 15k miles ago and spark plugs 10k miles ago. I was thinking the timing could be off, or sense its an oil compression based engine, running more air flow and not getting a tune might have messed something up? I'm gonna look at the fueling system. Anyone got any ideas please and thankyou.

 
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idle relearn procedure