Hey, just joined the forum but i have years of GMT400 experience. Bought my 2 door 98 4x4 tahoe in 2000 and still drive it everyday to work. 310k and still rolling. Of course i have replaced this and that over the years. I would like to get some feed back on the vortec engine and why gm didnt use the TPI induction system versus the central sequential induction system. I have owned a 87 Iroc in the past and thought the TPI was a good unit. Thanks for letting me join.