Air conditioner in the front randomly goes warm as I am driving..

What is your question?

and the vehicle jerks back and forth at the same time and sounds like it may cut off, then air in front gets cool again and still jerks back and forth. The gas pedal makes cracking and popping sounds as I press the gas pedal. The air in the back is always warm and never cool no matter how I have it set in the front. I thought I have had it repaired but the repair stays cool for a while then get warms again.