car running really boggy and rich after removing a box from the maf

[goj_cloud]

i have a 91 240sx stock ka24de, i open the hood because i notice when the car heats up the temp only stay at 3 notches instead of the needle being half way. i notice this box that was wired up to the maf, and i was thinking "this shouldn't be here. i pull the little box out and rewire the maf to the way it was, i started the car it idled really ruff if, i hit the gas and let off it will die.

its really rich also i have to stay on the gas in order for the car to stay on it jerks too. what is this little box for, ive had 240's b4 and ive nvr seen this before. i know it was working before though, but i checked with a mechanic to see what it was. he said it was probably a bypassor or somthing like that cuz the maf or the ecu probably didnt work. i also kinda messed up the wiring while taking the box out.

my question is, do you this i need a new maf and its wiring harness or is it something else heres some pics.

[sx moneypit]

You need to get the wiring straightened out first (get you a new pigtail) and solder the connections together, then see how it runs before you start hanging parts on it, then check the maf.

[goj_cloud]

You need to get the wiring straightened out first (get you a new pigtail) and solder the connections together, then see how it runs before you start hanging parts on it, then check the maf.

okay most of the maf sensors on ebay is like 30 to 40 bucks and 91+ will work right?

[sx moneypit]

As long as it is for 91 to 94 s13.