I never said you raised the boost. Spark gap opens over time. 1 or 2 psi is enough of a drop to cover up a few thousandths extra plug gap.

Also, when you say "it started when I installed a different turbo" what do you mean? Is it the same turbo you had, just a different one or a whole different type of turbo? You can't change a turbo and not change the tune unless you put the exact same turbo back on.

I went from a turbonetics t3 super 60 to a garrett t3 super 60 lol. Same housing a/r's, both standard bearing and shaft. I thought it was because I had reused a wastegate gasket a few times when I had the turbo off for other reasons so replaced it and it was still happening.

wg at 5psi cannot cause a misfire with a 7.5 spring... sounds like a tune problem to me... re-check your ignition and afr...

sounds like an ignition problem. sprakplugs or wires.

check your afr. i could also be an injector which is failing and causing this.

Not an injector or tune since Ive changed both of them since the problem has started. Now, I do have some problems in my tune which are getting resolved soon but thats a dif story since the problem has started before I even swapped pcm's..my tuning isnt as simple as for honda's lol.

Ordered new plugs. Go to autozone and what not and ask for ngk tr6's and they ask for ------- make and model. So I got the make and model, they come up for an 06 zo6 7.0 haha. If something is wrong with the wg though, it will give me an exuse to get that new tiny tial vband 38mm :)

hmmm... still cant see how it could be the wastegate, but do let us know what happens

Will do. Im waiting for my new tuned pcm to get here, then pop in a fresh set of plugs and do a heated o2 sensor and see how it runs. The tune is my original boost tune, just changed some other tables like trans settings,inj constant,idle,speed limiter etc. No pe or ve tables were touched.

I also ordered a turbo rebuild kit for my old turbonetics t3 super 60, and getting a nicely professionaly prepped shaft and .63ar turbine housing for it; tired of the damn 2-bolt grand national compressor on my turbo, plus my turbonetics has waay less miles. Also ordered some 2.5" piping and bungs to make a new dp to flip my turbo around for easier fitment issues, and the bung placement now puts the the o2 farther from the turbo than I like. Also gotta refab a wastegate elbow and mod my charge pipes cause flipping the turbo. Working on an automatic ld9 cavalier is a bitch when it comes to space back there lol. Gona be a fun project!