Hesitation at all speeds

[soloecho2]

Good day all.
Todays challange is my 2004 ECHO with 300,000 km developed a hesitation today.
This morning it was raining like hell on the drive in to work. No issues this morning on the drive in. On the way home leaving the parking lot I did not notice anything out of the ordanary. Untill I tried to make a left at a busy intersection. I had no power untill 4000 rpm then it came on like a switch.
While on the hiway if the car was loaded up in 3rd or 4th there was nothing there until about 3200 rpm again like a switch on and off. When I got home I checked the air filter, connections on the Mass air sensor, Cam control valve, Fuel injectors, Spark plug coil packs and all four spark plugs. All looked OK nothing out of the ordanary. Retested it again and the same issue slow acceleration until 4000 in first then like a swith power on.

If anyone has any suggestions please let me know ??

And no check engine light so far.