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large vacume leak in the intake manifold
You should be around 2200 - 2500 rpms.
check your vacuum hoses check your vacuum hoses
The throttle position sensor (tps) could make the rpms vary.
The idle control solonoid probably needs cleaning. Remove it from the throtle body and clean it.
The rpms need to be high enough to keep the engine running. Most engines need at least 850 rpms to keep from stalling.
NO
Switch to 4th gear!
yes,as long as when your warming it up keep the rpms down
Yes. Some. But you should have at least 20 - 40 lbs at idle. 60 - 80 lbs when running at highway speeds.
i would check the belts they are probably loose or worn
You have a vacum leak. A big one. Check all your hoses. Idle should be under 1k rpms