ok so i have a 95 xj an been having some problems with it the issue is i turn it on an doesnt want to start she cranks an everything but i try it a couple times after an hour or so an it starts up fine but when i turn the heater on the voltage drops an it drops even sometimes when i drive it stalled 3 times so far ive replaced the alternator, battery, all the fuses, fuel pump an filter an even my ignition switch an the cylinder idk what else to ive read a couple thread about the cps but idk any ideas??

 

With mentioning that the voltage drop and stalling, I suspect that you still have a weak charging system. The engine management system hates it when available voltage is low and stalling is a common symptom when that happens.

What exactly is it reading at the dash voltage gauge?

With a healthy charging system and battery, at idle speed you should be in the 13.5 to 14.0 volt range. You can also easily verify this with a meter, putting one lead on each of the battery posts in the DC Volt range.

 

Sounds like you replaced all the parts you need to get it to crank, but how 'bout regular tune-up parts..? cap, rotor, plugs 'n wires.. and of course the old 'inspect and clean all grounds' spiel.
Turning on your heater causing voltage drop could indicate a weak alternator.. but since you said it's new, maybe just a 'too loose' accessory belt. They seem to need to be extra tight.
A new quality CPS certainly wouldn't hurt, but i'd try basic tune-up parts first.

 

k thanks for the help guys did a basic tune up an found out the new ignition switch was faulty so changed that out an she started up right away

 

I have a 95 that needed a new ignition a little while ago. Is check the ends of the power lead to the battery, mine had so much acid in it that it was losing volts