I have a 92 Jeep Cherokee Sport 4.0 straight 6. At times I turn the key but it wont start. Battery is good and starter is new. Then turn the key again and it starts. Could the starter be bad or just a bad ground

This could be so many things. Bad battery connection, starter starting to go, fuel pump starting to go, relay/fuse broken. I would start with your battery and connections.

IF IGNITION SWITCH FUSE GOOD THE IGNITION SWITCH FAULTY MORE LIKELY.

Bad solenoid i would guess. Not making a connection there. Any basic wiring and ignition switch problems should be alleviated by jumping the starter with a screwdriver. I would check the solenoid and starter brushes

If the starter is new, and you hear it spinning, then the flywheel is bad and needs to be replaced

I'm assuming the starter is not turning the engine...check the small wire on the starter for 12v with key turned to start. If no voltage there, check ignition switch and neutral start switch. (voltage in, voltage out)

is it diesel engine?if so chech ur heater plugs

i had the same problem with my 92 cherokee laredo, could be the crank positioning sensor. if it goes bad you dont get spark from the coil. or it could be the coil, distributor, or even spark plugs.

Check the neutral position switch. this may need to be replaced or adjusted.

Try putting the car in neutral and starting. If its a manual trans it might be the clutch pedal safety switch or it may be something as simple as a loose battery connection.

Try this first. With one of you under the car whack the starter with a hammer as the other of you turns the key t the start position and holds it there. No wimpy whacks here give it one or two good ones. If it is a bad starter it may start this way. If it does, a new starter motor is in your future. Very easy to change on a Jeep. If it doesn't work let me know and we will go further.