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When I push in the clutch to shift up, the engine revs a couple hundred RPMs higher than when I let off the gas. Any ideas?

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1980 LUV 2wd - More pounds in rust than torque
1994 Jeep Cherokee 4x4 - Lifted with lights

Is it a Cali Truck?

Try pulling the wires off the switches operated by the clutch pedal and joining together. CAUTION you may disable neutral start switch.

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1980 4x4 KBD40 ISUZU/Chev Luv
Factory Fitted c190 Diesel Engine, ARB BullBar, Ramsey Winch, Custom Tilt Tray,

So far as I know, it's an Oregon truck. I'll give it a try. It's weird though, cuz it just started happening a couple days ago.

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1980 LUV 2wd - More pounds in rust than torque
1994 Jeep Cherokee 4x4 - Lifted with lights

Welcome to Luv Truck ownership

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1980 4x4 KBD40 ISUZU/Chev Luv
Factory Fitted c190 Diesel Engine, ARB BullBar, Ramsey Winch, Custom Tilt Tray,

Haha. That's what I hear. At least it gives me cruise control at low speeds! What is the normal idle speed? When I first start it up, it idles at about 700-800 rpms. When It's running and finally does slow down from 2500, it'll stick at about 1300 rpms. I haven't gotten a chance to check the clutch sensor thing. That's the one that's up under the dash on the clutch pedal, correct?

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1980 LUV 2wd - More pounds in rust than torque
1994 Jeep Cherokee 4x4 - Lifted with lights

Check for vacuum leaks.

The throttle linkage on the carb may be sticking, not letting it return all the way. Lube it with WD-40, inside & out. Also make sure your return spring is strong enough or maybe broken or missing since it just started happening.

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'78 Chevy LUV,1.9,4sp,headers,31's,SAS Dana 30,Dana 20,SOA rear w/Aussie Locker, rough body, bought new 12/4/78.
'87 Trooper,2.3,5sp,headers,31's,ball joint flip & spacer,Aussie Locker rear,Superwinch hubs,brush guard w/5.5K winch,more to come.