The engine hesitates during acceleration; it accelerates normally when the engine is cold, but hesitates when the engine starts to warm up. New spark plugs, new fuel filter, new air cleaner, new plug wires. It is a V6 engine. The hesitation subsides greatly when on the highway at 50 miles per hour. The hesitation is most significant at stop signs when the accelerator is pressed and when the engine is warmed up.

Anand Kumar

• 2035 Answers
• Posted on Jun 12, 2008

SOURCE: 1997 2.4L Buick Skylark stalling during takeoffs

There could the dirt in the engine carburetor please clean it or the the engine is getting rich ,or the on board computer may be faulty in the car or the wiring of the spark plug is defective get it checked ..............................



Good luck............................

SOURCE: 1999 Buick Regal hesitation while driving

most likely it is not actually a misfire it is the overdrive/TCC solenoid kicking on and off, it is a common GM transmission issue

SOURCE: hesitation acceleration

have you checked the fuel injector? if enough fuel is not getting through when accelerating it could "choke" causing the hesitation

SOURCE: engine hesitating during acceleration

Ok, there are many issues here that you will need to inspect. I recommend changing the fuel filter and pump as well. this will fix the hesitation. the intake and exhaust manifold gaskets will need to be replaced as well. this will stop the backfiring.

I also recommend checking and running a teat on the PCV valve and inspect the PCV hose as well. it could have a leak or a small crack on it.

Check the air filter and change if needed. this will help with acceleration issues as well. Next, i would run a check on all plugs and the complete wire set as well. change if needed.

Inspect the injectors for leaks and lose wires. make sure they are in good condition. replace any injectors that isn't firing properly.

Ok, there are some sensors that you will need to check as well. i will list them below.

SENSOR CHECK LIST--

1. Check the O2 sensors for worn wires.
2. Check the MAFS(Mas Air Flow Sensors) Check for Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit.
3. Check the Air Cleaner Temperature Sensor. this sensor could be damaged ro have loose wires. check accordingly.
4. Check the Throttle Position Sensor. this device could be connected wrong or it may be faulty as well. replace if needed.

Be sure and inspect all the above and repair any problem spot you ruin across during your inspection.

Please rate and god bless:)

SOURCE: Hesitation during aceleration

You may have a vaccume leak