[nels1316]

It is the 4.3 V6, 88,000 miles
It has had a normal tune up history.
Fuel Filter replaced about 20,000 ago
Fram air filter replaced 10,000 ago, Bosch Platinum plugs and wires replaced 15,000 ago.
No codes or check engine light.
Replaced catalytic converter and O2 sensors about 5,000 ago, could this have something to do with it, but problem was occuring before this.

Thanks for the help!