It does this at start up and when I stop then start the van again it chugs and will sometime stall unless I put one foot on the brake and one on the gas. Once I drive it a bit it clears up but the van doesnt seem to have much power, I assumed that to be because its a 4.3 V6.
There is 120 pounds in each cylinder and the van has 166,000 miles by the way.
I have heard that this can be anything from a bad fuel pump to leaky injectors, I've had a 4.3 blazer with a blown head gasket and its not the same smell.
I'm trying not to be lazy about fixing this so I'm trying to see if anyone has any ideas or can point out something I missed.