I noticed when installing new plugs(ngk 5992 gapped at .22)on cold stArt only the car will sound like a hiccup. With stock plugs it never did that. With stock plugs. No codes,did few logs and look normal too. It sounds like a miss,while it's running it would do a hiccup for a little then go away. Car is fbo stock snails and meth. Anyone see this.if I go back to stock plugs it's fine. But temps here are around 50f if that matters. Also running e60 mix blend.unless colder weather is causing this? This is only on initial starting car.
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