B2300 2WD L4-23L VIN D (2003) PROM Component Information TSB: Rough Idle/Boom/Vibration
1.
Verify customer concern.
2.
Loosen but do not remove the following:
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Left engine support insulator nuts.
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Right engine support insulator nuts.
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Transmission extension housing to cross member mount nuts.
Exhaust manifold to catalytic converter pipe nuts.
3.
Muffler and exhaust pipe repair: