Hello I'm gonna try to do my best explaining this.So I bought a 1995 Eclipse RS 420a off a guy who had rebuilt the whole thing after it sitting for about a decade or two. Whole car checks out, compression, wiring, fuel pressure, timing, spark plugs. But there's 1 engine code for P0118 Coolant...

methinks this engine is not running right bc it sounds as if one cylinder here and there misfires. it shakes a bit when idling but picks up when it revs higher. it lacks a bit of power when i drive it. i cleaned up and re-gapped spark plugs, same with plug wires, my injectors are working...