Coolio -- ANOTHER Police Run-In in Vegas

It hasn't been two months since Coolio was released from a Vegas jail -- but last week, the rapper was already back in the sights of Vegas law enforcement ... when police pulled his car over.

Law enforcement sources tell TMZ, Coolio was pulled over for having expired plates. He was cited for expired registration and no proof of insurance ... and subsequently let go.

A close call, but he's going back down a dangerous path when you consider Coolio was jailed back in March because of two active bench warrants out for his arrest ... both stemming from traffic violations.