Thanks for the replies, my thermostat is brand new OEM, but maybe I should check the Coolant Temp Sensor??
I suspected too large of an exhaust may be an issue, but hadn't seen any info about it. I did find two people in a post who claimed that it didn't matter what happened after the first O2 sensor, but I was skeptical.
Just to clarify: I'm running a VX exhaust manifold that connects to a short custom pipe that then runs into a DX down pipe and then through the OEM DX catalytic converter that is under the car and then out through the muffler.
Basically with the exception of the exhaust manifold and custom little pipe, the exhaust system is OEM DX.
I will work on installing the VX down pipe, in the mean time I'm open to any other suggestions
