1997 Toyota Corolla IDLE Unstable

1997 TOYOTA COROLLA
68,000 MILES • 4 CYL • FWD • MANUAL
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BIGJOE5263
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  • 3 POSTS
Hi there!..

I have a Toyota corolla 1997 model. i have notice the idle is unstable, the mechanic says that there is vacuum leak on the brake booster and so we replace the brake booster to a new one but not the identical size its a little larger but it is still toyota. After replacing, at start the idle gets worst it reaches to about 2200rpm for several minutes and then get back to 800rpm when the engine heats up.

whats wrong with my car engine? thank you in advance
Oct 20, 2010 at 10:11 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Check the idle air control valve and the MAF and TPS sensors
Oct 20, 2010 at 11:25 PM
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BIGJOE5263
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  • 3 POSTS
thank you for your reply...
Oct 22, 2010 at 7:23 PM
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BIGJOE5263
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when i press the break pedal, the engine is like choking, and when i release the break pedal the engine is like hunting or coughing, and you can hear it from the exhaust pipe..

is the problem coming from the engine?.. what causes that sound?
Oct 25, 2010 at 9:00 PM
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