Got an '87 Blazer with TBI, the error light comes on on long trips and reads that "the barometric pressure circuit voltage is low." It's not the MAP (it has it's own error code), but the auto guys I've talked to don't know. Rather fix it myself than shell out bucks to a shop (starving student, ya know...). Also... ever since getting a set of 33in tires, I've been wanting a little more stopping power. Any inexpensive ideas?