I own a 1990 Cutlass Ciera with 3.1 engine. I recently decided to upgrade the engine, I had a new block with new pistons and... and set of new heads which belong to 2.8 engine.i put all new stuff on the car but now it starts pinging on hard acceleration and uphills ...! but it idles well.
The pinging is gone as i remove the Knock sensor !! but the performance is not still great.
I just checked the knock sensor with Rockauto and they used same part on 2.8 and 3.1 engines.

Should i use another ECU on 2.8 engine ?!