[lxndr]

Check for vaccuum leaks. Use a can of carb cleaner or starting fluid and spray it at the base of the carburetor and intake manifold while the engine is running. If you have a leak the idle will even out for a moment as the fluid seals it. Check your hoses for cracks.

Also, make sure that your alternator and voltage regulator are supplying the propper voltage and check that your battery is in good condition.

You may also want to check your fuel pump to see if it is supplying enough pressure.

Does your car blow smoke?