Problem is that engine was just put in with trans. Only had 40k miles on engine, and engine runs fine until it warms up. Check engine light comes on reads engine misfire #3 cylinder. Changed plugs, wires, rotor and cap, & injector and ECM, and still does it.
What was the trouble code?
Were there any other codes stored in memory?
Do you feel the misfire under any conditions (under load or at idle)?
If it's a confirmed miss under load at #3 determined by a cylinder balance test. Gotta test spark, fuel and compression at that cylinder.