If this problem occurs when load is applied to engine due to transmission engaging one of two things is wrong. First and probably the least expensive would be your manifold air pressure sensor or MAP sensor. Next thing could be a problem with your transmission or torque converter rather staying locked up and stalling the engine out. Good luck
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You can "shift on the fly" at up to 45mph - just let off the gas and pull the shifter back to 4hi. DO NOT try going to 4lo while moving.
Another way is to stop, put it in neutral, and pull the shifter back to 4hi or 4lo.
This is vacuum activated - so if you can't get it to engage - the vacuum motor is failed - or you have a disconnected or rotted vacuum line.
Cherokees have the command - track. You'll see a lever next to the
transmission shifter that has letters 2H, 4H, N, 4L on it. You can
shift from 2H (2wheel drive high range) to 4H (4wheel drive high range)
at any legal speed. If it's an automatic, I recommend just taking your
feet off of both pedals, so there's not a lot of torque being passed
thru the transfer case. If it's a standard I recommend stepping on the
clutch when you shift, but it's not necessary. To go to Neutral just
pull the shifter back one more position to the N position. To shift
into 4L (4wheel drive lo range) you must be stopped. I also recommend
shifting the transmission into neutral when you do this. Push the
shifter to the right, then pull it back.
Either your idle air control is bad/gummed up or your throttle position sensor is bad-you should also make sure there is not some issue with your accelerator cable binding, starting up at 5 grand could be fatal-any check engine light? has there been someone under the hood recently, who didn't connect up vacuum hoses?
Okay I had the same problem and what ya do is take that little mechanism apart and there will be a plastic gear inside, if those teeth on that gear are sheered then that is your problem and you can pick that gear up at the nearst chevy house for about $5.00, I am just telling you this becous buying the hole thing will run between $350.00 and $400.00 bucks. if that isn't your problem though then it is a short somewhere or loose wire. Good Luck and hope this helps.
if u got automatic front hubs stop put in park pull 4x4 shifter into 4 wheel
manual hubs at front wheels turn the hub locks to the lock position and then pull the 4 wheel shifter inti 4 wheel
also look over drivers sun visor if the tag aint worn off the direction are there... have fun 4 wheeling and keep the rubber side down
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