I have a 1990 Dodge 4x4 w/TBI 360 cid. It won't stay running after you release the key when you try to start it.
It fires right up every time then dies as soon as you release the key??? I have replaced the fuel pump, filter, dist. pick up... checked all wires and relays and connectors... I am stumped, Please help if you can.

 

Sounds like an ignition switch gone bad to me. Gives power to the engine when in the "Start" position but cuts power when it goes back to "Run".

Derek

 

That would be my guess also.

 

that was it the switch... [:@]