# Surging

**URL:** <https://community.cartalk.com/t/surging/36502>\
**Category:** Maintenance/Repairs\
**Tags:** pontiac\
**Created:** [September 12, 2009, 1:00pm UTC](https://community.cartalk.com/t/surging/36502 "2009-09-12T13:00:06Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![chadallen1979](https://avatars.discourse-cdn.com/v4/letter/c/db5fbb/32.png) [@chadallen1979](https://community.cartalk.com/u/chadallen1979)\
**Post date:** [September 12, 2009, 1:00pm UTC](https://community.cartalk.com/t/surging/36502/1 "2009-09-12T13:00:06Z")

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hi. my car is surging. its an 85 fiero gt-2.8. I have replaced ALL the vacuum lines, plugs, wires, air filter. am going to change fuel filter as well, i just want to know if anyone has any other ideas on why this is happening. i run high octane and it has been re-chipped to performance. does anyone have any ideas? because after the fuel filter i am out of ideas.  
  
  
  
 thanks

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [September 12, 2009, 3:55pm UTC](https://community.cartalk.com/t/surging/36502/2 "2009-09-12T15:55:29Z")

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Check for a vacuum leak at the intake manifold.

Tester

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**Author:** ![pleasedodgevan2](https://avatars.discourse-cdn.com/v4/letter/p/ad7895/32.png) [@pleasedodgevan2](https://community.cartalk.com/u/pleasedodgevan2)\
**Post date:** [September 12, 2009, 4:13pm UTC](https://community.cartalk.com/t/surging/36502/3 "2009-09-12T16:13:48Z")

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Please describe when surging occurs. Driving or idling? Trying to maintain constant speed?

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**Author:** ![chadallen1979](https://avatars.discourse-cdn.com/v4/letter/c/db5fbb/32.png) [@chadallen1979](https://community.cartalk.com/u/chadallen1979)\
**Post date:** [September 12, 2009, 6:25pm UTC](https://community.cartalk.com/t/surging/36502/4 "2009-09-12T18:25:32Z")

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ty for responding. the surging happens when trying to maintain constant speed, usually 25- 40 mph. does it bad after i have been driving it for a while. when at idle, there seems to be no problem. also when i accelerate hard, it doesn’t seem to have a problem either. someone mentioned vapor lock. does that fit? ty