my setup is a 88 astro with a 4.3tbi, 1998 4l60e origin unknown and a complete harness with ecu from a 2002 blazer.

so far I have installed everything and modified the bin with tunerpro to remove stuff like vats ectect.

im not sure if that could cause an issue but the rpm signal is directly taken from the distributor but according to the sanner the reading seems ok ish ( my van does not have a tach ) and tps seems to be working just fine but the trans wont do anything. Commanded gear is stuck in 3, manualy going in to first seems to be working but will not shift by it self unless I go back up in drive, and will stay in 3rd and not go in OD.

Anyone have some experience tuning a 0411 for that application ? I would like to make sure my pcm is properly programmed before looking into mechanical issue.