2000 jeep cherkee 4 liter sport runs rough, stalls sounds terrible. replaced coil pack and new spark plugs, replaced crankshaft positioning sensor, took gas tank out and cleaned it and replaced fuel filters and fuel pressure regulator Any suggestions?

Is this a 4.0 liter or a 2.5 liter wrangler? Sometimes the crankshaft sensor causes these things to make these codes come up. Crankshaft position sensors are very common of going bad on Jeep vehicles.

Try using one of the old plugs and connect it to #1 and a good ground then try starting to visually confirm if spark is/is not present. Its much easier to see the spark in the dark. If you get a spark the problem is not electrical and could be a bad ground between the plug and the block, rarely happens, but not unheard of.

I don't think it's electrical unless there is a rev limiter in the electrical components; I would also do a compression test to make sure the motor is functioning; with all cylinders having adequate compression go back to electrical and replace component in charge of firing;

check the spark plug wires. go somewhere dark, get a spray bottle with some water in it, then mist the spark plug wire and look for a spark to jump

TO REPLACE SPARK PLUGS YOU REMOVE COIL PACK MOUNTING BOLTS THEN REMOVE THE COIL PACK WITH BOOT OVER THE SPARK PLUG.YOU HAVE 6 INDIVIDUAL COIL PACK TO EACH CYLINDER. YOU NEED A 3/8 RATCHET WRENCH - LONG 3/8 EXTENSION -SPARK PLUG SOCKET - SPARK PLUG GAUGE.AND TORQUE WRENCH.THE 2000 MODEL JEEPS FUEL FILTER INSIDE THE TANK.1993 - 1996 MODEL JEEPS FUEL FILTER LOCATED LEFT SIDE OF THE VECHICLE NEAR THE FUEL TANK.

could bea few things. Excessive moisure, low fuel pressure, Faulty coil pack, spark plugs gap or wires. Have you changed any of those at all? Let me know

Sounds like the ignition coil is getting bad.

my jeep was misfiring and i changed the same parts you changed.... When you changed your crank sensor, did you get parts from the dealer? if not u should trying changing the crank senor part from tne dealer. After market parts do not work good on Jeeps I had to learn the hard way..

Have run into this problem with the Jimmy and Chevy pickup. The CPS is often the cause but as you havere placed it, make sure it is good by the way my first was bad. Check your computor harness connectind to CPU as if it gets pinched somehow it will give you the same reaction. It will take patients to check the harness. Good Luck hope this helps.

Pop off a spark plug wire, insert a screwdriver into the wire (hold onto the handle), hold a 1/4 inch to 1/2 inch away from engine and crank the engine. There should be a spark. If no spark you have a problem with either the ignition system or the ignition system control circuits. Generally if the computer dosen't see a crank signal you will not get a spark (if it doen't see a cam signal you won't get fuel). If no spark from wire try it on each wire. If not a single wire has spark, rent a scan tool from autozone or napa and see if there are any stored codes, also see if any codes come up while cranking. If you can't rent one you can buy a cheap one for under 30-40 dollars. If no codes and no spark the only thing you will have left to try is replacing the coil pack/s. If after replacing the coil packs you still don't have spark you will have to take it into a shop to have it checked out. The reason you would need to take it into a shop is because they will need to plug in a very expensive scan tool(1000-5000 dollars) that will show them all the sensor inputs. Hope this gets you up and running.