1994 GMC k1500 Issues
 

Hello! I have a 94 gmc k1500, 4.3l v6 engine that has been showing code 35 for iac problems. I replaced the iac valve and made sure all of the hoses were properly connected but my truck is still having issues. Basically, the truck will switch gears normally (its an automatic) but it works much harder to get there when its accelerating and is much noisier as if the rpms are much higher. Once the driving at the same speed it sounds/acts how it normally does. Does anyone have any tips or ideas as to what may be causing this?