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Engine surging at idle when pressing on the gas
, I…

Customer Question
Engine surging at idle...

Engine surging at idle when pressing on the gas

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

I changed the TPS Idle control module and checked for leaks at the intake manifold.

Mechanic's Assistant: OK got it. Last thing — JustAnswer charges a fee (generally around $18) to post your type of question to Chevy Experts (you only pay if satisfied). There are a couple customers ahead of you. We can help you for less if you're not in a rush. Are you willing to wait a bit?

Yes

Submitted: 2 years ago.Category: Chevy
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Answered in 1 hour by:
1/19/2016
Chevy Mechanic: BOBBYSS, Master Technician replied 2 years ago
BOBBYSS
BOBBYSS, Master Technician
Category: Chevy
Satisfied Customers: 17,611
Experience: ASE MASTER CERTIFIED, AA DEGREE AUTO/DIESEL TECH
Verified

Hello, my name is Bobby. Can you tell me what kind of vehicle this is? Is the check engine light coming on?

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Customer reply replied 2 years ago
1997 Chevy Venture no check engine light
Chevy Mechanic: BOBBYSS, Master Technician replied 2 years ago

Thank you. Does the engine run fine at higher speeds?

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Customer reply replied 2 years ago
it does
Chevy Mechanic: BOBBYSS, Master Technician replied 2 years ago

Thank you. Most of the time this is caused by a vacuum leak. The most common vacuum leak occurs on the bottom side of the intake manifold gasket. In some cases you can pull the oil filler cap when the engine is running and see if there is a large amount of vacuum. If there is then there is a leak. If not then it may be a failing MAP sensor or this can even occur if the engine needs a tune up, though that is not nearly as likely.

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Customer reply replied 2 years ago
Thanks so much
Chevy Mechanic: BOBBYSS, Master Technician replied 2 years ago

No problem. If you need anything else please let me know.

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Chevy Mechanic: Roy, import/domestic specialest replied 2 years ago
Roy
Roy, import/domestic specialest
Category: Chevy
Satisfied Customers: 7,900
Experience: ASE master tech for 40 years
Verified

good morning my name is ***** ***** I will assist

just wanted to add from what Bobby gave you. EGR valve having carbon on the pindle is also a common issue with this problem. you can remove the valve easily and check the bottom for any chunks of carbon.

Roy

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