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Posted on Jan 02, 2017
Three speed automatic? If so the TCC solenoid is bad.in the transmission. Its under the side cover on the driver side. You can unplug wire connector going to front of transmission so you can drive it until you get it fixed. It will use more gas due to no torque converter lock up.
Posted on May 23, 2009
Here is the common cause of surges, 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.
Posted on Jul 06, 2009
My Pontiac Grand Prix is also a 99, it has 216,+ thousand miles on it, it runs great, idles good, I need to replace the oxygen sensor tho as it shuts off on me while driving or sometimes coming to a stop. You might try checking the fuel filter and pump as well.
Posted on Jul 07, 2010
I'm having the same problem. At first I thought it was bad fuel so I replaced the fuel filter to no avail. Then I cleaned the Mass Air Flow sensor which also didn't work. Is your check engine light on?
Posted on Aug 13, 2010
Its the IAC i had the same issue, with my 2002 xl-7 with 159,000 miles on it, i had it clean and it causing me no more problems. the part itself to replace is 200 bucks at Autozone and my mechanic will do it for 100 bucks in labor. Good Luck
Posted on Nov 24, 2010
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