My 2000 Ford explorer sport misfires under a load. what could cause this problem

Altenater 14+ volts, plug wires homes 6 To 10, plugs are good. Changed plugs and wires about 3 months ago do to misfire, ran great till this issue. Changed battery just because. engine is a 4.0 4x4 sport. Bought used a year ago. Will check for vacuum leaks and go from there. Check engine light is on. We changed the fuel filter do to it running lean. Thanks for the quick response.

yes,check for vacuum leaks.also you said the check engine light is on.go to autozone and have them read the code/codes.then ask them to print it out for you,it's free!post code/codes here.it could be one of many things,but i have seen so many false codes,due to vacuum leaks,and vacuum hose is cheap.post findings.

Found code/codes we got from our local repair guy in town AutoZone is to far. P1747 Presure control sol A Short circuit P0743 TCC system elect p0750 shift sol A malfunction P0755 " " " B P0760 " " " C P0765 " " " D P1451 evap says vent control Valve civ malfunction P1409 electronic vac reg ctrl civ malfunction. Any more ideas? Please help

well,is your transmission fluid brown looking,or is it red?you have several transmission codes.you also have an egr code.did you check for vacuum leaks?check them all if not already.there is one on the egr valve also.the valve may be sticking,not opening and closing.you have to remove it and clean carbon from it.also you have an evap code.all that evap stuff is close to your fuel tank.the solenoid valve may be stuck.it's gonna take a little work,but it can be done,you have to start somewhere.if your tranny fluid is dark in color,i would change it,and the filter.

Traning fluid is red. Was a little low but topped it off. Haven't checked vacuum lines yet. That makes since now thank you and will update later.

okeydokey