Need some help on jeep

If that motor doesn't have hydraulic lifters, try loosening your rocker shafts. It will clatter, but it will run. That's what I had to do on my old slant 6.

Cam Sensor? Not sure exactly but will make for harder starts and even an occasional no start situations. Also rough running idle and poor performance.

There are several configurations of engines; the older overhead valve conventional cam, overhead valve with overhead cam or cams utilizing chain drive, overhead cam engines with staggered chain drive, gear driven overhead cams and the most common belt driven overhead cam engines. Although each engine has its own specifications, developing the skills to remove Autocome cdp pro

not breaking the bank is the real problem
first cheap mod is in replace the cam shaft with a torque producting cam ( not high lift or long duration as that gets to lumpy motor operation)
that will improve the engine breating with out making it a lumpy operation
next is to get a set of tuned mandrel bent extractors to assist with the better breathing cam
next is a properly balanced exhaust system (an accredited professional exhaust shop for this )
next is a decent carburation system
bigger is not better so don't think that a 750 double pumper will be better than a 55(with vacuum secondares)properly tuned as too much fuel puts out the fire.
the use of a chassis dyno and good speed shop advice will save money here)
next is a good electrical ignition system
prices are not always equal to performance
replace the stock air cleaner with a unit that allows the filter element to breath all around
so far all the items can be found from profession speed shops but try to pick one that has a chasis dyno so that you can gauge the effectiveness of what you have bought rather than just throwing money under the hood
you notice that at this stage I have not mentioned , over bored cyl;inders , increasing the stroke, port and polished , roller cam followers roller .rockers because if you want all of that you need to open the wallet wider and the engine will not be as reliable as it steps into the high performance bracket and that equals more stress on the moving parts
a smooth powerful car that has a good exhaust sound is more attractive that a lumpy loud piece of rubbish, and is more economical and reliable and will probably cost a lot less
shop carefully and use logicic in determining what you want

Putting a r/v cam in sometimes will help a bit. An r/v cam will not really give you more HP, but will move the torque curve of your engine to a more usable rpm range. Believe it or not, most of the gain you will see isn't from the cam but is from changing the timing chain which in a high mile engine is likely worn. Most engines benefit from advancing the cam a few degrees (they actually sell kits for doing that) when installing. As a chain wears, it actually retards cam phasing.
Changing anything usually is a trade-off. Moving the rpm range of the cam will add low end response but will take away high end performance. If you do not generally run the engine up to 5,000 rpm, you may not notice that though.
Changing the intake, adding headers or adding a "performance chip" all have some benefits but never really give you the "advertised" increase. As far as those chips go, they generally work up around 4-5,000 rpm's and don't add much to everyday driving (read: worthless).
In reality, the most reliable way to restore lost power in a high mile engine is to do a total rebuild or find a compatible engine with lower miles. There is no "bolt on" cure for internal wear and though the Jeep engine is a tough reliable old bird, they do wear!

Answer

pic REMOVAL - 4.7L
The Camshaft Position Sensor (CMP) on the 4.7L V–8 engine is bolted to the front/top of the right cylinder head (CMP Location—4.7L Engine).

It is easier to remove/install sensor from under vehicle.

Raise and support vehicle.
Disconnect electrical connector at CMP sensor (CMP Location—4.7L Engine).
Remove sensor mounting bolt (CMP Location—4.7L Engine).
Carefully twist sensor from cylinder head.
Check condition of sensor o-ring.
See picture for sensor location.

my 1996 jeep grand cherokee lmtd. won't start did tune up. cranks but no fire. please help. engine code 54 shows up . cam shaft positioning no signal. . tested all circuit. changed cam shaft positioning sensor twice.still cranks did start once ran for 5 min. changed the sensor again. no luck. help please. keith

Yes, you can have just a lifter replaced, but it could be other parts as well...like a valve, rocker, or cam shaft. The valve cover needs to come off for a better inspection.

IF YOU PULL OUT CAM SENSOR YOU HAVE TO PUT A TOOTH PICK IN THE TWO HOLES ON THE TOP AND THEN PUT IT BACK IN AND FACE IT TO THE BACK OF THE ENGINE.KING OF 4.0

You say you changed the cam sensor. A1391 code is a crank sensor on the top of the trans. bell housing.