As above, it looks like either a EGR, AIR, or CCP solenoid. Where do the two vac lines go to?
The pink wire should be switched 12v, and the white wire should connect to the ecm. A easy way to test, if you have the ability, is to unplug it, and the ecm. Then check between the white wire on the connector and any white wires you see on the ecm connectors and checked for continuity. Once you find it, then just look up what that pin is on the appropriate wiring diagram.
79 Cherokee Chief 401/T18/D20, MPFI fuel injection, hydroboost, otherwise stock.
Future mods: Caddy 500/NV4500/NP205, HP D60 front D60 smooth botom rear, 5.13 gears, 35x12.50's on H1 beadlock wheels. Warn M12000 winch.
93 Wrangler 4.6 stroker/AX15/NP231,SYE,CV, OME 2.5 lift, front hub conversion/big brakes, 31X10.50's Warn M10000 winch.