2000 s10 2.2l flex bad performance issue
 

I recently bought a 2000 Chevy s10 extreme has 2.2l flex fuel and has bad performance issue there's little acceleration until it hits 3500 rpm give or take I have a check engine light for cam position sensor circuit low but I do not have a cam sensor anywhere on my block???? Not sure if previous owners did ecu swap or maybe motor swap? Please help

its left of the oil filter
post the code

No I have looked all around there is no spot on the passenger side of block so I am assuming I am dealing with a motor swap then. Were is the engine vin? I looked last night cant find it says its rear of block just behind oil stick opening? thank you for replying and your time

partial VIN etched on the left side of the engine block above the starter

OK so its not in the back its on the side?