Your description indicates a fuel starvation or choking problem. I assume it is a carburettor model and either there are times when the engine is getting too much fuel - or too little, probably the latter.
There could be a blockage in the carb or the fuel pump might be worn or there could be a foreign object in the fuel tank sometimes blocking the flow.
It is also possible your vehicle is suffering carburettor freezing. This usually takes place, not in freezing weather as would be expected but in cool, damp conditions. Vehicle manufacturers go to great lengths in combatting this with warm air collected from around the exhaust manifold and mixed with the cooler air of the normal intake, usually controlled automatically by a vacuum operated flap.
SOURCE: 1998 jeep wrangler dont shift into 1st or reverse
I will bet it grinds when you try to engage first or reverse. When this happened on my car, I adjusted the clutch and it improved. You need about a half inch of free play when you first touch the pedal with your foot. If you have a slave cylinder, (hydraulic clutch). You may need to bleed the system. With air in the system, you can't get enough clutch to fully disengage the trans from the motor.(Clutch and pressure plate) It's like you only pushed down half way on the pedal. If it's not hydraulic, it should be adjusted with wrenches. If clutch is fine, It could be a loose shift linkage. It would seem extra sloppy when moving shifter, It would just not go in gear, with out the grinding.Hope this helps. lbreen
SOURCE: 95 Jeep wrangler wont go in gear
if this is something that started suddenly, it could be a leak in your master cylinder or slave cylinder, or your fluid could be low, or there could be air in the lines. Make sure it's full of fluid, and get back to me.
SOURCE: 1991 jeep wrangler: alternator overcharging
It sounds as the voltage regulator which is built into the back of the alternator has stuck. Occaisionally this even happens on new ones. Would suggest taking the alternator back as it shoud be under warranty.
SOURCE: 1990 Wrangler yj 5 speed manual transmission -
The clutchless shifting doesn't help your cause any. Has the fluid been changed yet? Start with fresh fluid and go from there.
SOURCE: 1989 jeep wrangler wont shift gear and clutch gone loose
If the clutch system is hydraulic, check the clutch master cylinder for proper fluid level. If out or nearly so, look for signs of fluid leakage around the master cylinder, the hose down to the clutch slave cylinder, and the slave cylinder itself. If everything looks dry, fill the master cylinder with fresh fluid, bleed the air out of the system (like the brake system), and check that the clutch arm is moved by the clutch pedal properly. If all looks correct, try putting the transmission in gear with the engine running. Hope this gets you running!
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