NGK BR6's & miss fire

Ever since switched from TR6's to BR6's I have a miss fire down low 1/4 throttle and clears up in boost. No codes. Sounds like a wrx with exhaust for a minute. Is this normal? BTW it's pretty cold out, I haven't drivin it in warmer weather yet.

What did you switch from? TR6?

Yeah sorry I edited it.

P0175 popped up.

Cleared the code cleaned the maf. Still misses. Help.

Could moisture in my fuel cause this?

Well I just put a set of br7ef's in mine and arounD 1200-1700 rpm with hardly any throttle min will miss a little. Once it hits 2000 it stops and no problems under throttle

I put a bottle of heet in the tank and threw some other plug wires I had layin around on it and it seems to be doing ok now.

I had that when I had my plugs gapped too big. I regapped them a bit tighter and downlow it cleared up that stutter sound

what did you have them gapped at? I'm with ducky on this one. The 'original' gap recommended for our trucks was for a platinum/iridium plug. When going to a copper plug, you typically have to close the gap down. I run around .035 on mine, and they seem to be pretty good. I'm running nitrous over boost, but should be close to the same gap (I would think)

These plugs come gapped @ .026 so I left em. I was told to run .025-.028 for boost.

wow...br's are THAT much closer then the Ts? No clue then. I wouldn't go any closer then that lol

Lol yeah. I'm wondering if it needs the crank re-learn procedure. But there's no codes.

I had at least one dead cylinder this morning for about 5 miles. Still no codes. Wouldn't you think there would be a random misfire code by now? Any suggestions on how to diagnose this?

why not continue to run the tr6? if your truck ran good on them before and the only thing you changed was the plugs id guess the new plugs are the culprit.