1JZ hesitation issue
 

Once I hit full boost, it spudders like its hitting a rev limiter, I've researched on here about it, and I haven't found any conclusive information to fix the issue, just a bunch of dead ends. The car was running perfect and boosting fine till I changed the plugs, I got them from autozone and they are the 2jzgte plugs, as they didn't have the part number for the 1jz. I also changed the oil, I put in Q horsepower 10w30. Thanks.

Sounds like you might've unknowingly messed with the coilpack wiring. Make sure all the coil pack connector wires are plugged all the way into the connectors.

Just changing plugs and oil wouldn't do this.

btw- what part number were the plugs you bought? NGK 6097 seems to be the all time favorite 1jz plug

oh yea what did you gap the plug too? Should be maximum of .032, more like .028

I didn't gap them, I presumed they were pregapped to the correct specification. The plugs are NGK BKR6EGP 7092's.

I checked the gap, it was between 32-35. I tightened down all of the coil packs, and if this doesn't fix it, I'm going to get the 6097's.

Get some NGK 6097s, and gap them down to .022-.028

The 1jz can be picky about the plugs and having the correct gap is important..right now the gap is off and that can cause hesitation on boost.

Hopefully it's not your ECU, because the 1JZ ecus are junk.
Mine was doing the same, But it was the EcU, and check the coilpack connectors they go bad also because of the heat.

I just got back from getting spark plugs, after my raid of the local autoparts stores, I was only able to find 5 6097's and 1 4544 which suppositively are the same thing jus updated.

i still havent resolved similar problem, gonna shrink the gap in min e too, but along with the high boost sputtering (anything over 12psi) it seems like I also have an audible and occasional idle miss. on top of all this the car smells like a boat when its running.

You just described my car, it stinks so bad, I had to stand around it for 40 minutes while I was failing emissions test and I wasn't sure if I was going to make it out alive. I changed the plugs to the 6097's, the other plugs were basicly dead, they were in there for 3 days and had almost completely burned away.I haven't had the chance to boost it yet but I will on the way home.

how would one go about identifying a bad ecu anything visible to look for?

Well it was the plugs, it boosts fine now

how many lbs of boost you running? you say it was problematic at .32 and you regapped them to .28?? made the diff??