1995 mustang gt, just picked up the car and don't idle very well. Checked all exhaust temps with heat gun and 2,3,4 are 100 c colder than the rest. Switched out injectors no change, checked volts on connectors all good. Did comp test all good, changed plugs and wires, change fuel filter, changed cap and rotor. What's next I'm at a loss, has some motor work done. Hydraulic cam, roller rockers, aluminum heads. Possible the exhaust valves not set to 0 lash and are to tight? Any help would be great

 

Many possible things. Im assuming you have actual spar and fuel injector pulse? Who insyalled the cam? Did they break it in correctly?