Just bought a 74 260z with an L28ET swap and an AEM Infinity 3 ECU on top of what appears to be frankensteined with parts from other Z's (280zx,300zx) this makes it a bit harder for me to compare other peoples build and troubleshoot. Keep in mind the only mechanical experience I have is adding bolt on performance mods and have never taken the plunge into real tuning/modding but I am eager to learn.
The issue with the car is that it struggles to start at first but does end up running since I was able to drive it home and take it out on some spirited runs. But if I shut the car off and try to start it back up it takes a while and it wont run properly since it bogs/backfires until I turn it off and crank it again however it idles at around 1200-1400rpm.
The tachometer also isn't connected as I cant seem to figure out how since it appears to have an ignition coil from a z31 with a PRW2 and the wiring is different colors than what I have seen online so ill have to figure that out and in the meantime I'm using my laptop connected to the AEM ECU to see where the RPMs are at.
Basically I'm asking for help on how to get the timing/tune corrected. From what I have searched I'm suppose to get the car to idle around 750-800rpm and adjust timing to 20 degrees however according to other posts I have to lower the rpms with the ecu instead of a physical throttle screw. It would be smarter to just take it to a tuning shop but Id like to take a crack at it myself. I've already taken screenshots of the tune the way it is as a "backup" before I mess around with it. Do any of y'all have experience tuning with AEM? Maybe see the screenshots for yourself and see if anything is off or can point me on how to at least lower the RPMs so I can set the timing properly. Any help is appreciated. Thank you!
Edit: Here is a link to higher quality images.
https://imgur.com/gallery/5sQzZ2D