Gmc Sierra dies when shifted into drive. We have made sure the tbi is working properly the only way you can keep the truck where it will run and drive is to advance the timing to 12 degrees but the when you shift it into drive it bogs down until the truck warms up
There is also a thump that comes from the front passenger side but I do not think they are related because the thump is so spastic and the idle and drive problem is constant.
Kick ass site : -)
Wednesday, February 8th, 2012 AT 6:17 AM