my son has a 91 isuzu trooper he drove to the store did his shopping and when he came out the trooper would not start. he has tryied a control module and a distributer , he also tryied changing the coil still no spark he does have power to the coil with the key on. any suggestions

 

short in the wire maybe? check the ground?

Are the plugs dirty?

is he getting any crank?

i remember this happened to my 90 trooper, and as it turns out, the connections for my battery were loose, so i wiggled them, and she turned over right away.

hopefully this helps.