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93 s10 blazer starts sometimes with rough idle and runs fine on the road so what could it be?

1. Check the fuel system. A rough idle and stalling can sometimes be caused by a problem with the fuel system, such as a clogged fuel filter or a faulty fuel pump. Check the fuel filter and replace it if it is dirty or clogged. If the fuel pump is faulty, it will need to be replaced.

2. Check the ignition system. A rough idle and stalling can also be caused by a problem with the ignition system, such as a faulty spark plug or a bad distributor cap. Check the spark plugs and replace them if they are worn or damaged. Check the distributor cap and replace it if it is cracked or damaged.

3. Check the air intake system. A rough idle and stalling can sometimes be caused by a problem with the air intake system, such as a dirty air filter or a blocked air intake duct. Check the air filter and replace it if it is dirty or clogged. Check the air intake duct and clear any obstructions.

4. Check the throttle body. A rough idle and stalling can sometimes be caused by a dirty throttle body. Clean the throttle body with a throttle body cleaner.

5. Check the idle air control valve. A rough idle and stalling can sometimes be caused by a faulty idle air control valve. Check the idle air control valve and replace it if it is faulty.

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