2000 Chevy blazer v6 vortex
 

Runs great when it's cold, gets up to operating temp and the rpms and speedometer just all over the place, check engine light comes on, check Gage's light comes on, almost no oil pressure on the gage, loss of acceleration. Pull over let it sit start her up runs good till it gets warm again. I replaced the fuel filter, ignition coil the other day, distributor and rotor about a year and a bit ago as well as plugs and wires, I'm at a total loss where to from here

temp sensor drivers side between back 2 plugs or o2 sensor