Get a O2 sensor wired up on your car ASAP. You'll have to get an O2 sensor bung welded to the downpipe for sure as I've done the same on my car. This may affect your running issues.
Its a KX Motor to start. When its first started after sitting for more then 4 hrs (cold start) it pulls like a bat outta hell untill i get down the block to stop sign. Pull out from there and its back to feeling like its got 45 hp... Also the vehicle doesnt really move on its own without the WOT switch zip tied on. i started replacing coolant temp sensors as ive heard they have alot to do with fuel mapping. Anyone elas have simular issue? the vehicle also doesnt currently have an O2 sensor because it has 4000cs manifold and downpipe.