Under part or full throttle settings I am getting major hesitation. This happens throught out all gears. Nothing when the car is not in gear tho. Example: Feels like when your teaching someone to drive stick and its jerky during the starts and gear changes. I have Air/fuel gauge installed and during full throttle it give a full lean reading. ( Just a flashy light gauge not a wide band) I was thinking O2 sencer. Does anyone have any helpful tips or answers?

05 Ralliart with RRM SRI and Underdrive Pully.

 

does the motor cough and backfire when it hesitates? or does it climb revs but dont accelerate? what does it do/sound like?

 

Sounds like your O2. If you absolutely floor it during this hesitation does the power come back?

 

No cough or backfire during the hesitation. And the power does not come back. When you hit the mivec point there feels like not increase in power.

 

99% sure it's your accel pedal position sensor. You're getting the lean reading because the sensor is erroniously letting off the throttle.

 

I found the answer on the 30th. I feel like a retard now lol. My intake pipe was loose just after the MAP sencer. So when I hit the throttle the pipe would jump off and bypass the sencer thus no reading.