Check your air filter: if it's very dirty, replace it.
Buy a kit for the carburettor and once you have replaced everything, check that the float level is correct.
Ensure that the carburettor is properly torqued down and that no air gets in between it and the inlet manifold. Use an approved gasket sealant on the gasket between carburettor and manifold.
Ensure that the ignition timing is correct for your particular altitude. Use a timing light to set it.
Buy a workshop manual for your make of car: they have extensive trouble-shooting hints and tips.
If this is a more modern car, with fuel injection and electronic, computerised systems, take it to an approved workshop and let them sort it out as tampering with anything could just make the problem more complex and cost a bundle to fix.
Things You'll Need
a good set of tools, including spanners and screwdrivers.
Your wits about you.
You might want to change the spark plugs while you're about it.
Workshop manual to show you how everything is done.
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