Hoping someone can point me in the right direction on this. Mods in Sig for reference.

So last night I washed my car as I left the car wash my car felt sluggish. It could be a coincidence? Basically what it is doing is feels like a total turd with anything below 2/3rd throttle. As soon as I pass that point it takes off (surges with power)quickly like normal. If I smash the throttle from a stop it pulls great also. If I go part throttle it almost feels like the stall is locked up and sluggish. It does the same thing on the highway feels sluggish unless close to WOT. I checked all fuses and connections. The whole setup is new in the car also minus the transmission.

Any ideas? Also swapped TPS.

Thanks
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Update car runs great until it hits operating temp

 

Post this in the diagnostic and tuning section and you will get more replies. Sounds like when the pcm goes into closed loop(at a certain temp around 130 degrees it goes into closed loop) you have your problems. Most likely an 02 sensor problem but could be other problems.

 

I agree on the 02 sensor... seen this a few times with no codes.. if not, maybe fuel or spark related?

 

Any update? Get it fixed?