Hesitation under light acceleration

[kasper618]

Ok, I have to post here because I'm classified as "new" still... but here is one for you guru's.

Car is a 1998 Spyder GST, 3" turboback, hard UICP, 1g BOV, other then that bone stock 7bolt.

The car hesitates and bucks under normal acceleration. What I replaced with known good parts are the following...

-Front o2 sensor
-Mas (not hacked)
-Plugs (bpr6es gap .028)
-Wires (oe type)
-Coil pack
-Fuel Filter

The car has no boost leaks, pressure tested to 20psi
Has EGR blockoff plate installed, with emissions removed
Ecu came from a known running car

Here's the kicker, if you unplug the TPS sensor, the acceleration hesitation goes away completely, but the TPS is not bad. I ohm'ed it out, and as well replaced it with a known good one just in case, same issue.

What am I missing.....? Thanks

 

[kasper618]

Well, turns out... the "new" o2 sensor I got from the store was a "new... dead" o2 sensor. She's all good now...