acceleration hesitation HELP!

[88Bronco2EB]

I have an 88 B2 2.9L It runs great when its warm, ever since I got the O2 sensor replaced. But every once In a while their will be some hesitation in the acceleration Its not the tranny. could it be the preset fuel mixture the computer uses before the engine is warm??? or a bad Cat?? any ideas will be awesome!

 

[lumpy4000]

fuel filter?? had same problem on the wifes blazer, replaced fuel filter and viola!!

 

[94gexplorer]

i dont know if you have a maf but my explorer was hesitating and cleaning the maf helped

 

[88Bronco2EB]

I figured it out the timing is off, it was timed with a bad O2 sensor, know that I have a new one I need to change the timing to normal.

 

[dangerrangerstx]

get a bigger foot jk do a tune up or get a v8 lol