2003 grand marquis 52,000 miles... just now developed a small rough idle
No ck engine lite comes on... standard small v-8.. help please? Richard

. Install new Motorcraft platinum spark plugs.

. Clean the throttle plate and throttle body.

. Clean the Idle Air Control Valve (IACV).

. Replace air filter and clean air box.

If the problem persists, focus on the MAF Sensor.

Quote:

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Originally Posted by TxGreaseMonkey

. Install new Motorcraft platinum spark plugs.

. Clean the throttle plate and throttle body.

. Clean the Idle Air Control Valve (IACV).

. Replace air filter and clean air box.

If the problem persists, focus on the MAF Sensor.

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Thank you v much