Question about 1999 Pontiac Sunfire

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Engine hesitates or stalls

1999 sunfire when the engine gets hot the engine stalls when i step on the gas or as im driving the engine hesitates. I changed the plugs & engine coolant temp sensor. I also changed the intake air temp sensor. What could be the problem or do you have any other suggestions. Thanks. Joe

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This might be what we call vapor lock try driving with your gas cap off and see if it still quits under the same conditions.

Posted on Jun 17, 2009

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Posted on Jan 02, 2017

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Car wont stay running unless foot is on the gas pedal


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F22? 2.3. 2.7? 3.0L?
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does that help,. no, then take it top the man, the ASE man.
The Mechanic.with the ASE patch on his /her sleeve.
no year, ouch.

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Read the following and follow the instructions for this problem.

Here are the most common causes of idle surge, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

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Perfect Idle, no Codes, but stepping on gas causes hesitation


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