I work for a GM dealer, and see this problem regularly.
It is an issue with the mass airflow sensor. This is what you do:
Remove the sensor
Remove the 4 torx bolts that hold it together
Take the 3 pieces apart, but note the direction everything goes back together
On the center peice, you will see 2 or 3(depending on the model) very small resistors. DO NOT TOUCH THEM WITH FINGERS OR SCREWDRIVER! They are very delicate and will break easily!
Spray them with brake parts cleaner and gently clean them with a Q-tip.(the back side of them will be really dirty)
Assemble the pieces exactly how they came apart and re-install.
Start up the van and be amazed at the power it has now.
It is an issue with the mass airflow sensor. This is what you do:
Remove the sensor
Remove the 4 torx bolts that hold it together
Take the 3 pieces apart, but note the direction everything goes back together
On the center peice, you will see 2 or 3(depending on the model) very small resistors. DO NOT TOUCH THEM WITH FINGERS OR SCREWDRIVER! They are very delicate and will break easily!
Spray them with brake parts cleaner and gently clean them with a Q-tip.(the back side of them will be really dirty)
Assemble the pieces exactly how they came apart and re-install.
Start up the van and be amazed at the power it has now.
