o2 sensor question!

[texasfunk]

When i put headers on my truck (1994 tbi 5.7) a few months back i didnt hool the o2 up but i never had prpblems with the truck...til it got cold...now it runs terrible in the mornings...and most of the day...in park or neutral it will idle and rev fine..but in drive it spits sputters has no power and here recently now the kick down wont work..it just stays the same speed and i have a ton of trouble getting it to 60 on the highway and i have never had any problems before this...the obvious is the o2 sensor but is there anything else i should look for? Or is it the o2 causing me this headache.....
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