do you have Uprev to datalog? if you do, datalog every time you drive the car. it's annoying but i finally captured the lead up to one of my lag events all the way thru to where it was actually happening until i reached my destination. Downside is that nothing stood out like a sore thumb but in depth analysis showed some leads which im still exploring.
a failing pump will show a lean AFR so datalog that, accelerator pedal sensor, throttle position sensor (these 2 you use together to ascertain your command vs the 'response' in terms of what the ecu gives you), both IVT solenoid duty, both cam sensors, rpm, vehicle speed, coolant and oil temp, both VVEL angles plus voltages, maf voltages. you can add MAP, load and a few others
failing pump would cause stuttering too.
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