2003 H2 poor acceleration when cold & warm

[RJ03]

Hi, I'm having poor acceleration when cold and even when it's warm. No trouble code light. Recent plugs, wires, fuel and air filter. I also cleaned the MAF with a MAF cleaner spray. I did notice a little oily/carbon build up at the throttle body. Haven't cleaned that yet, but will once this rain stops. While its cold, I press the pedal to like half to three quarters to the floor and horrible acceleration. As I start to let off the pedal it actually feels like its accelerating better. I do run fuel system cleaner through the system on occasion, use quality gas. I'm baffled. Thanks in advance for any suggestions, recommendations, etc. RJ03