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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Pontiac Technician
Category: Pontiac
Satisfied Customers: 2377
Experience:  GM Grand Master Technician 2007. 14 years experience.
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2003 Pontiac grand am 3.4 has idle surge if I hold the tach

Customer Question

2003 Pontiac grand am 3.4 has idle surge if I hold the tach at1000 rpm then let off the throttle rpm drops to about 600 rpm then surges to 1100 rpm before returning to normal idle speed
Submitted: 1 year ago.
Category: Pontiac
Expert:  Jeromy Madison replied 1 year ago.

That is usually a sign of vacuum leak somewhere.

Have you inspected all of the vacuum lines and hoses?

Could be an intake manifold gasket.

Do you have a scan tool?