1999 grand cherokee limited just cuts out while driving. wait alittle while and starts,only tohappen again and again

The fuel pump is starting to go bad

Hoefully the fuel filter isn't ten years old

is it all wheel drive? It's probably your front drive shaft. Very common.

possible crankshaft position sensor problem as symtons are as described

Fuel pump

fuel filter is clogged try replacing it

Check spark first if ok then look at the fuel system.Check if the fuel pump is working continuously when turning the key.If so remove the fuel line to the ejectors and check if there is fuel there.If no change the fuel filter.

Sounds like you both are having problems with your coil packs.  When they start to go bad and get hot, they will shut down on you for a while until they cool back down enough to start working again.  They will get progressively worse as time goes on.  I believe that you can take the coil packs to AutoZone and have them tested for free.  Let me know if you have any other questions, but I think this will take care of you both.  Thanks for rating my response and for using FixYa!

Starter...if the starter is old, it is getting heat soaked. Replace the solenoid.