Miss fire under acceleration

[rylan]

My 1989 ranger 2.9 i cant seem to get it to no missfire or stumble on its self under acceleration. Kinda seems like WT seems to be better than 50% throttle for some reason.

I changed out the
-Ecu
-AIT sensor
-Tps
-O2 sensor
-disbrutor/wires/plugs and coil
-fuel pump/filter. Getting solid pressure to manual and rising under theottle movement
-cleaned throttle body..
-multiple TFIs. Checked plug and it getting all the readings.
-timing multiple times checked. Wire triple checked..

At this point I dont know what else to do.. other than injectors. I took the vavle covers off and the rocker arms are all moving and seem fine.

 

[franklin2]

What plugs are you running and did you gap them? Going from memory, is it .045? I would also check the wires with a meter while you are moving them around. If you are too rough with them, they are very easy to break. Happens especially when you are doing a lot of engine work and are pulling them on and off.

 

[dvdswan]

Welcome to the site.

 

[rylan]

I just swapped the wire out with OEM motocraft ones, checked timming and the spark plugs are at .045. And it kinda seems a bit better. But still kinda missin under acceleration. Maybe a new oem distubtor?
Any thoughts what else to check.

 

[alwaysFlOoReD]

I remember a cylinder balance check test on some ford ecu. Not sure about yours tho.