new O2 sensors now running way to rich

[deeptone]

Is there a difference between O2 sensors besides the numbre of wires?
I changed my exhaust for an offroad H pipe without cat, and broke my stock O2 sensors.
So i replaced them with universal ones.
But since then the car idles and runs way to rich.
It is also much slower down low and a little slower up top, and burns a lot more fuel.
Any ideas what i did wrong or where to look.
The car is a '88 5.0 ho gt converted to mass air.
Thanks.
mike