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I am not familiar with this car model but i would presume that the engine is linked with an automatic choke for cold starting and the revs should go down as the engine starts to heats up. this probably works on a vacuum system based around your inlet manifold, and the noise your hear could be a leak in the vacuum pipe. you should pop your hood before starting and try listening for that noise to pin point it's location. if your lucky you might just find a small crack in a pipe that can be replaced with ease. of coarse first thing in the morning would be the best time to check this when the engine is cold.it's worth giving it a go and i hope you get it sorted,good luck
This is most likely a noisy lifter (or valve tappet). In cold weather, the clearances in the valve train open up because metal contracts due to the cold. Once the oil pressure comes up after start the noise goes away because the larger clearance fills with oil and the lifter becomes "cushioned" with the oil. The proper fix is to have the valves adjusted. I believe in your model, that is done by putting shims on the lifters. This will quiet the noisy lifters. In the short term, you can try using a lighter weight oil for cold weather. This will get the oil to the lifters faster after start up and quiet the tapping more quickly. Once the weather warms again, shift back to the normal weight.
It sounds like the lifters are draining down over night. When was the last time you changed the oil? A fresh oil change may do the trick, if not try some hydraulic lifter additive ( you just add to the engine oil)
depends, how long between oil changes, how many miles, try and engine flush, sometimes debrise adn sludge will cause a lifter to stick and not move freely causing the tapping noise you hear, if this doesn't fix or quiet the problem it may be to far gone, but if you really love the car get a tear down manual and go to work....put aside a weekend and about 500 dollars it'll be a job
It may just need to be adjusted (it sounds like it's too loose). If the belt isn't cracked or frayed, you should just have it tightened up a bit . If there are signs it is worn (cracked frayed) replace it.