No, the wiring harness and computer (PCM) from a 1997 and 1999 2.2L Chevy S-10 will likely
not be directly interchangeable. While the engines themselves might be mechanically similar, there were changes made to the engine management system (including wiring and PCM programming) between those model years. Even minor differences in sensors or emission control systems can cause incompatibility.
Trying to use the incorrect harness and PCM will almost certainly result in the engine not running correctly, if at all. You'd encounter trouble codes, erratic operation, or potentially damage components. You'll need to use the correct year's harness and PCM for your specific year's S-10.
