91 rodeo engine running bad
 

hello all , i have a 91 rodeo 2.4 5 speed , on hot days i have no power at all , i notice on colder or cooler days i have alot more power from engine , i did tune it up , plugs, wires, rotor ,cap , still same problem, can it be timming or the egr is bad , i did replace a bad hose to the EGR that was prolly broken for a long time , still no power on hot days or warm days
any help wouokd be appreciated