Any comments on this problem?

[rally370]

Hi dudes,

In the engine section I've posted about my new engine but figured certain folks would not read about my problem:

One problem I had was the the MAF was bad so thanks to Blackbart I solved that problem. Anyway the engine passed it's smog with the CEL on which turned out to be the white heater wire had come off the O2 sensor as I had put one of those Ebay universal jobs on. The engine runs well with this wire disconected. Once I conect it the engine runs really rough below 3000rpm. Like it's running lean. It idle fine. revs up good but would pull. Like I said without the white wire it runs well. So I replaced the O2 for a better unit . CEL is off but it still runs crap. I have a 255lph pump on order as my pump is the original 200,000 unit.

Could the heater wire coming off have trashed the ECU? or something else?