# Revs smoothly in park, but

**URL:** <https://community.cartalk.com/t/revs-smoothly-in-park-but/56262>\
**Category:** Maintenance/Repairs\
**Tags:** corolla, toyota\
**Created:** [October 12, 2010, 1:16am UTC](https://community.cartalk.com/t/revs-smoothly-in-park-but/56262 "2010-10-12T01:16:15Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![mxsurf](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mxsurf/32/340_2.png) [@mxsurf](https://community.cartalk.com/u/mxsurf)\
**Post date:** [October 12, 2010, 1:16am UTC](https://community.cartalk.com/t/revs-smoothly-in-park-but/56262/1 "2010-10-12T01:16:15Z")

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when idling in drive it has these quick hesitations about 4-7 seconds apart, like someone bumped into the back of our car very lightly. I guess I should check spark first. bought it 7 months ago(smallest engine: 1600). The Distributor cap and wires look fairly new.(the concensus is to bite the bullet and buy the cap and wires from Toyota, which I have been doing, but it’s now $130 ouch! If you can help, thank you… Mike

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**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\
**Post date:** [October 12, 2010, 1:26am UTC](https://community.cartalk.com/t/revs-smoothly-in-park-but/56262/2 "2010-10-12T01:26:38Z")

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Did you ever replace the fuel filter?

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**Author:** ![mxsurf](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mxsurf/32/340_2.png) [@mxsurf](https://community.cartalk.com/u/mxsurf)\
**Post date:** [October 12, 2010, 3:33am UTC](https://community.cartalk.com/t/revs-smoothly-in-park-but/56262/3 "2010-10-12T03:33:12Z")

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Haven’t had the car very long but that’s a good place to start - thank you…Mike

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**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\
**Post date:** [October 12, 2010, 3:46am UTC](https://community.cartalk.com/t/revs-smoothly-in-park-but/56262/4 "2010-10-12T03:46:03Z")

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Just go ahead and do all the basics. New plugs & wires and filters. Clean the throttle body and MAF sensor.

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<div class="post-metadata">

**Author:** ![mxsurf](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mxsurf/32/340_2.png) [@mxsurf](https://community.cartalk.com/u/mxsurf)\
**Post date:** [October 12, 2010, 4:21am UTC](https://community.cartalk.com/t/revs-smoothly-in-park-but/56262/5 "2010-10-12T04:21:03Z")

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I’m not familiar with MAF…something air flow ?

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**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\
**Post date:** [October 12, 2010, 4:31am UTC](https://community.cartalk.com/t/revs-smoothly-in-park-but/56262/6 "2010-10-12T04:31:30Z")

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This engine system doesn’t use a MAF (Mass Air Flow) sensor. I have the same engine in my '92 Celica. A thorough throttle body cleaning would be a good idea, though.