1995 GMC Yukon running rough

My truck is being very weird. It start running rough had to give it gas at a stop to keep it running. Also from idle to 2500 rpms it doesnt want to go. From 2500 on its ok. Then it got worse it wouldnt idle or go over 10mph. So I checked the computer and it gave codes 35 and 44 one was the air idle control and one was lean exsaust gas and low fuel pressaur or oxgen senser. I changed the fuel filter and it seemed fine but its not. Then I changed the coil full tune up top of the line (msd). Now it is crapy till 2500 and fine in nutrle its good and wants to stall idling or in gear it dies. Im getting frusrated!