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Usually the spark plugs or the timing.
Check the idle sensor if you have one.
Check the throttle position sensor or the idle control motor
Loud idle? no, not turn over ,yes
The carburetor needs rebuilding.
tps or idle speed motor
vacuum leak, check hoses, purge solenoid valve, evap.
Either the car wont start or, it will not idle right (its going to fell like its going to turn off).
Could be you need a new fuel idle motor. Or you need new spark plugs
may need to tune it. mess with the idle screws til it starts(should be located near carborator
need more info but just guessing here vacuum leak causing high idle and dieseling cause by high fuel air mix why it will not shut off
we have a ford escort lx and it wont start without the gas throttle half way then it starts but is very rough but wont idle by itself