2.9 miss...

[hillvalleybronc]

i have an 89 bronco 2.9...ran fine then developed a miss..installed new plugs, wires, cap, rotor, fuel filter..new o2 sensor..switched out map sensor off a working 2.9.. cannot figure this one out..any help.. cats are fine..could use any help..thanks

 

[kbold]

is it running rich/lean? getting hot? black smoke out the exhaust? check for vacuum leaks also..

 

[hillvalleybronc]

plugs look fine...not rich/lean..checked for vac leaks...nothing..only does it after bout 5 mins of run time..

 

[volrath]

could be your TFI module
that will make the run bad