low rpm bog on \'87 TBI K5 Newbie alert. Been lurking the board for a good while now, and finally deciding to put up a post. Great site. I just purchased an '87 poser rig last week that I am very excited to get into. (Have been tinkering with my 82 for a good while) Its a TBI K5 with 350, 700R4, 6" Pro Comp lift, 35" ProComp mt's and as far as I know stock gearing in the 10 bolts (3.08, 3.42??). Its a mess of a showboat setup as is, but its a super clean TX truck with less than 90k miles that I couldn't lay off. Anywho, its got a definite miss or bog at low rpm's (but not at idle) and at each shift before cleaning out. The miss/ bog is well beyond what the 35's are doing to the highway gears. Any ideas? MAP sensor, TPS sensor...? Has new fuel filter and o2 sensor. By the way, I'll get the gear ratio ironed out soon with either smaller rubber or a axle swap, but need to hammer out the bog first.