85 cj7 4cyl runs good in first two gears then boggs down

With the engine at #1 TDC your rotor bug should be pointing at your #1 plug wire.

check emissions controls lines for leaks, did you clean/change distributor cap?

IF VECHICLE RUNNING ROUGH OR MISFIRING YOU COULD HAVE WRONG SPARK PLUG GAP.SHOULD BE 0.040 - 0.043 IF PLUG GAP CORRECT YOU HAVE WRONG PLUG WIRES OR WRONG TYPE OF SPARK PLUGS.

Engine distributor out of time,,,with crank ,or the cam has jumped time from the crank shaft,, maybe 1 tooth

Hi wyocwboy here, Have you changed Spark Plug Wires ,or distributor Cap & Rotor? If you have this really sounds more like a Few spark Plug Wires have Been put on wrong. If you have'nt changed opr moved any of the wires or changed cap & rotor,Its Possible that your Timing Chain has jumped a Notch.Clean off your Damper -Which is the Bottom Pully your Hamonic Balacer, then rotate your enging until you Find your Timing Marks, Clean good and take a Marker or best a Chalk or Soap stick and mark it a 8 Degrees BTDC (Before Top Dead Center) Hook up a Timimg like Assuming it does run.And see if your able to see the Timing light Flashing on the mark if not Rote your Distributor either way Slowly and See if you can get the Light on the MARK you Made on The Harmonic Balancer. If Not Either Your Timing Chain Jumped a Notch or your Distributor may be off a nocth. To Check to see if your Timing Chain Jumped a Notch =Remove the COIL WIRE from Distributor Cap So it Won't Start then Remove #-1 Spark Plug Have a Friend Turn the Key off and On just Bumping the Engine a Little at a Time,Keeping a Compression Gauge in the #-1 Plug Hole When the Gauge Needle goes up you are close to TDC (TOP DEAD CENTER) STOP THERE .Check to see if the Mark on your Bottom Pully you made is at or Close to Ling up on top dead center. Trace #-1 Spark Plug Wire up to the Distributor Cap Remember the wires In the Dist. Caps Position or mark it to. Pull the Cap off The Distributor Rotor Should Be Pointing to Close to Where Your Number 1-Spark Plug Wire was Located.
Run These Series Of Tests and it Should Tell you or Give you a Very Good Idea of Your Problem. Please Let Me Know if This Helped You. FROM THE WYOCWBOY

if your engine run before you changed anything,and you are talking about a 3.0 engine,
you have to be careful changing wires on this engine,
you need toonly change one wire at a time,the distributor cap on this engine is just stupid.
if you look under the cap you'll see that a wire on the one side of the cap actually has a contact that leads to the other side of the cap.
cly 5 cyl 6
cyl 3 cyl 4
cyl 1 cyl 2
front of engine

if your looking at distributor cap from front of engine,
two screws hold down cap.
look at the screw closest to the front,from that screw second hole to the left is #1.
firing order is 123456
#2 wire will be at that front screw on cap,keep installing wires counter clockwise.

Check for broken timing belt. Put a screew into spark plug head put the other end close but not touching to a metal engine part. have some one check for spark while you turn over engine. if thei is no spark check with distributor cap off if the rotor rotates when engine is being tuned over. if not then check timing chain. Good luck.

vacuum advance working ? do manuel check with cap and rotor button off and see if it's moving. chris

could be that your distributor is out a tooth

I had the same problem with my 85 cj7 this week, I relpaced the ignition control module, plugs, wires, cap, rotor and the the coil; still had no fire to plugs. the problem turned out to be my distributor, replaced it today and she fired right up. Most likely it was the pick up module in the distributor that went bad.