I was driving my truck a few nights back and it was runnin just fine and i went to start it back up and it would hit and wouldnt run so i started replacing things with the ignition control module and ignition switch and turned out my tach wire had grounded out and wasnt letting the coil fire and after i disconnected it from the coil it started.Now im having issues with it popping and backfiring out of the pipes when im really getting into the throttle or im going uphill.As of today ive replace the icm once again,computer,distributor,plugs,wires,coil and its still doing the same thing.Only thing i can think of now is that it messed up my injectors or i still got something shorted out and its confusing because it will crank up just fine and its running smooth but once i get into it struggles a little then opens up then started popping

 

Sounds like timing