1995 Pontiac Transport firing order

Engine Performance problem
1995 Pontiac Transport Front Wheel Drive Automatic 130k miles

A friend of my husbands changed the spark plugs and wires on our van. Now it runs really bad. Everyone has said that he connected the wires wrong. I need a diagram of the wires and firing order for a 1995 pontiac transport 3.8L engine.

Thanks.

Holly Karpew