I have a 99 Cavalier 2.4 litre that has an idle problem.It has high idle in nuetral at app.1200-1500 rpm,runs down rod fine til you let off throttle then drops to 500 and surges to about 1300 till you come to stop then about1200.Have replaced tp sensor and iac to no avail.It was what the code reader said. thanks for your help.
MAP sensor
Check your vacuum lines for leaks. Symptoms suggest vacuum leak.
SOURCE: 90 chevy 5.7L k1500 failed emissions
COULD BE A VACUUM LEAK TAKE PROPANE TORCH AND LEAVE OFF PUT AROUND ALL VACUUM POINT WHERE YOU SUSPECT COULD POSSIBLY LEAK ENGINE SPEEDS UP THAT'S IT WORTH A SHOT BEFORE SPENDING MORE CASH
SOURCE: 2004 Chevy Cavalier 4 cylinder Engine Surge
you should have them look at the catalyic converter
SOURCE: idle at 1500 to 2000 rpm
Most likely the throttle body gasket (between the throttle body and the intake manifold) is leaking.
SOURCE: 5.7 litre engine surging
Try to disconnect the battery negative cable, and hold it to the positive post for half a minute. This will reset your computer. Reconnect the cable and start it. It may "hunt" for a while to re-learn. This is normal. Drive it to see if there is a change.To be continued....
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