No1 cylinder misfire when engine is cold

[casiaw16]

2000 ford ranger 2.5 engine. when engine is cold i get a no1 cylinder misfire. compression is good, swapped injectors (1 and 4 and 2 and 3),but misfire is always in no1. new spark plug wires, cleaned injectors, new coil packs, coolant sensor is good, new ECU.
When engine temp is normal engine runs fine.

 

[envious8420]

possible sticky valve. hook up a vacuum gauge to the motor when cold, if it pulls steady, it most likely ok. but if its bouncing around its time to dig further into the head.

 

[casiaw16]

vacuum is stady. thanks