Blip at light loads

[RAS]

Greetings!

Seeking some advice in a light load hiccup I'm having. Occasionally I will get a buck/hiccup when very light on the throttle, it is almost like I completely let off the throttle and mashed the gas again. I have attached the calibration, a datalog from a cold morning warmup, and a 30 minute datalog on a drive to work.

I have attempted some street tuning, but by no means consider myself to "know" what I'm doing. I have been doing a lot of research and learning as I go. The motor has 1800 miles on a rebuild, please see below...

B20Z2 Block
Wiseco 11.4:1 CR Pistons
1994 PR3-1 (Someone did a mild port on intake side)
GSR Cams (No cam timing advance)

Any assistance is greatly appreciated.

[Spunkster]

Did this occur in the datalog, and if so, what is the time stamp it occurred?

[RAS]

I'm pretty sure it happened between 21 and 21:05, and again at 21:50 to 22. Is it normal for the TPS to be that all over the place in the log? I will log again in the morning and try to note exactly where it happens.

[RAS]

The issue was exceptionally bad this morning. I was able to get quite a few logs, ended the log and started a new as the issue presented itself. Looking through them I think I've narrowed it down to an issue with the TPS. You'll notice the spots in the log that will show like a 15" MAP reading, but 0% TPS. This is where I'm getting the "hiccup". A few of the occurrences I was able to look over and see 0 on the TPS display while this was happening.

[RAS]

Upon further investigation of Blip2, at 1:14 and beyond, seems to me something is causing the ECU to cut out. When the issue occurs the MIL comes on, and all sensors stop reading.

[RAS]

Replaced TPS, issue gone. The datalog below shows the smooth TPS reading, whereas the previous was all over the place.