jerKS under load replaced just about everything ! !!

I don't think so because it will start every time and I have a remote and it starts fine with that,,,also the remote does bypass the vats system and start the car. Than when its under load it will have the jerk,,,until it loses compleat power to the system and upon a restart,,,runs fine. Now,,,when I have the problem and it cuts out to the point where the red lights come on ,,,for even a split second than if it fires back up no problem. You must put power to the system TWICE before starting the car than its like new. Guess I just have SPECIAL RIV HUH LOL

I gotta bring this car to someone who can test the brainbox l bought another one from eBay for $20

Alright, I'm having pretty much the same issue. I hope it's not trans related, but here's what I've done/haven't done.

Tested when the jerks happen. They seem to only happen when I get above ~2psi of boost (according to my gauge and DHP). When they do happen I noticed the needle on the boost gauge bouncing up and down, but DHP does not indicate anything like that under the log. They will also happen in any gear, but will not happen if I just rev it in neutral or park (basically whenever there's no boost). They also do not appear to be RPM dependent, but rather throttle dependent. I can hold it in first or second all the way up to the top of the rev range, but when I give it enough throttle to get into boost it starts jerking around. It gets worse when it goes into OD (heavy load), but when I stay in third or lower it drives just fine as long as you stay out of boost. I made a video showing what's going on, and will post it when I get a chance. Car idles just fine, no issues there. LTFTs and AFR look good in my scan as well. I also checked vacuum lines and they appeared fine, but I'll do a once over on them again. Trans fluid was a tad low, being at the bottom of the indicator and did not smell burnt. Engine oil was pretty clean (less than 1k miles since last change) and at the right level. DHP also registers the throttle position properly, so no issues with my wiring there.

I haven't replaced or changed anything. I'm thinking about doing plugs/oil/plug wires to see if they fix anything but want to know what you guys think.

Forgot to add that I'm not getting any check engine lights/codes. No misfire, no torque converter, nothing.

If you ain't getting a misfire I would think about spending cash for plugs and wires. It didn't do anything for me. I'm heading home with a 04 park ave I bought in Atlanta now. The riv is going in the shop when I get home. I'll post the repairs and anything I found after christmas. I will fix this problem or sell my riv really cheep lol

wondering if it might be something as simple as a restricted air filter or debris in the air intake system?

Nope everything cLear there

Welp, found that the downpipe wasn't sealing so we fixed that (sooo much quieter now), and the stuttering got better but it's still not completely gone. I was at least able to go WOT with minor stutters, but noticed I was only building around 5psi where as before I was getting ~11psi. Vacuum leak?

What fuel trims are you seeing? Can you get us a scan?

I'll get you all a scan tomorrow. PM me your address so I can get the bar shipped out to you.

Here's your scan:

https://www.dropbox.com/s/cy8y13m4y1rpidw/trouble1.csv?dl=0

As you can see everything looks somewhat alright. Fuel trims are still a bit high and O2s are a bit low, but nothing major. I also checked my codes this morning and found a 1645 and 1655 which weren't there last I checked. I cleared them and we'll see if they come back again. The stuttering was definitely better today, but it was still there a little bit. I checked all of my vacuum lines again and didn't find anything.

Your fuel trims look decent. A lot better than mine are right now.

You are only pushing ~4PSI at WOT with a 3.4" pulley? That cant be right!

Your vacuum looks strong too.

Timing looks decent too with 0 KR. I dont know man....

Ima go ahead and excuse myself from this analyse. I have no idea why youre getting such low boost. Maybe your BBV or something? I dont see a vac leak from this scan, tho.