Toyota Supra MK3 won't start

[Sinacio]

Good afternoon
I have a 1989 Toyota Supra MK3 with the original 7M GTE engine and the car stopped starting after changing the spark plugs.
Can anyone help me identify the problem please

Thanks

 

[Abe's 1987]

Do you still have the old spark plugs? I would drop those back in and see if it starts to rule out the spark plugs.

Does the engine just spin just no start?

Battery good?

Spark plug wires new or old?

 

[Sinacio]

Good afternoon

I replaced them with new spark plugs and from that moment on the engine turns over but won't start.
The spark plug wires are old

 

[Sinacio]

The battery is in very good condition.

 

[alcyon]

Good afternoon

I replaced them with new spark plugs and from that moment on the engine turns over but won't start.
The spark plug wires are old

Like what Abe said, put back to old plugs and try. Also, stating the obvious, make sure the plug wire sequence are correct.